Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mm/arm940.S: utility functions for ARM940T |
| 3 | * |
| 4 | * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | #include <linux/linkage.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <asm/assembler.h> |
Russell King | 5ec9407 | 2008-09-07 19:15:31 +0100 | [diff] [blame] | 14 | #include <asm/hwcap.h> |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 15 | #include <asm/pgtable-hwdef.h> |
| 16 | #include <asm/pgtable.h> |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 17 | #include <asm/ptrace.h> |
Russell King | 8a5544c8 | 2008-08-12 14:02:23 +0100 | [diff] [blame] | 18 | #include "proc-macros.S" |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 19 | |
| 20 | /* ARM940T has a 4KB DCache comprising 256 lines of 4 words */ |
| 21 | #define CACHE_DLINESIZE 16 |
| 22 | #define CACHE_DSEGMENTS 4 |
| 23 | #define CACHE_DENTRIES 64 |
| 24 | |
| 25 | .text |
| 26 | /* |
| 27 | * cpu_arm940_proc_init() |
| 28 | * cpu_arm940_switch_mm() |
| 29 | * |
| 30 | * These are not required. |
| 31 | */ |
| 32 | ENTRY(cpu_arm940_proc_init) |
| 33 | ENTRY(cpu_arm940_switch_mm) |
| 34 | mov pc, lr |
| 35 | |
| 36 | /* |
| 37 | * cpu_arm940_proc_fin() |
| 38 | */ |
| 39 | ENTRY(cpu_arm940_proc_fin) |
| 40 | stmfd sp!, {lr} |
| 41 | mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE |
| 42 | msr cpsr_c, ip |
| 43 | bl arm940_flush_kern_cache_all |
| 44 | mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
| 45 | bic r0, r0, #0x00001000 @ i-cache |
| 46 | bic r0, r0, #0x00000004 @ d-cache |
| 47 | mcr p15, 0, r0, c1, c0, 0 @ disable caches |
| 48 | ldmfd sp!, {pc} |
| 49 | |
| 50 | /* |
| 51 | * cpu_arm940_reset(loc) |
| 52 | * Params : r0 = address to jump to |
| 53 | * Notes : This sets up everything for a reset |
| 54 | */ |
| 55 | ENTRY(cpu_arm940_reset) |
| 56 | mov ip, #0 |
| 57 | mcr p15, 0, ip, c7, c5, 0 @ flush I cache |
| 58 | mcr p15, 0, ip, c7, c6, 0 @ flush D cache |
| 59 | mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| 60 | mrc p15, 0, ip, c1, c0, 0 @ ctrl register |
| 61 | bic ip, ip, #0x00000005 @ .............c.p |
| 62 | bic ip, ip, #0x00001000 @ i-cache |
| 63 | mcr p15, 0, ip, c1, c0, 0 @ ctrl register |
| 64 | mov pc, r0 |
| 65 | |
| 66 | /* |
| 67 | * cpu_arm940_do_idle() |
| 68 | */ |
| 69 | .align 5 |
| 70 | ENTRY(cpu_arm940_do_idle) |
| 71 | mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt |
| 72 | mov pc, lr |
| 73 | |
| 74 | /* |
| 75 | * flush_user_cache_all() |
| 76 | */ |
| 77 | ENTRY(arm940_flush_user_cache_all) |
| 78 | /* FALLTHROUGH */ |
| 79 | |
| 80 | /* |
| 81 | * flush_kern_cache_all() |
| 82 | * |
| 83 | * Clean and invalidate the entire cache. |
| 84 | */ |
| 85 | ENTRY(arm940_flush_kern_cache_all) |
| 86 | mov r2, #VM_EXEC |
| 87 | /* FALLTHROUGH */ |
| 88 | |
| 89 | /* |
| 90 | * flush_user_cache_range(start, end, flags) |
| 91 | * |
| 92 | * There is no efficient way to flush a range of cache entries |
| 93 | * in the specified address range. Thus, flushes all. |
| 94 | * |
| 95 | * - start - start address (inclusive) |
| 96 | * - end - end address (exclusive) |
| 97 | * - flags - vm_flags describing address space |
| 98 | */ |
| 99 | ENTRY(arm940_flush_user_cache_range) |
| 100 | mov ip, #0 |
| 101 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| 102 | mcr p15, 0, ip, c7, c6, 0 @ flush D cache |
| 103 | #else |
| 104 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments |
| 105 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries |
| 106 | 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index |
| 107 | subs r3, r3, #1 << 26 |
| 108 | bcs 2b @ entries 63 to 0 |
| 109 | subs r1, r1, #1 << 4 |
| 110 | bcs 1b @ segments 3 to 0 |
| 111 | #endif |
| 112 | tst r2, #VM_EXEC |
| 113 | mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| 114 | mcrne p15, 0, ip, c7, c10, 4 @ drain WB |
| 115 | mov pc, lr |
| 116 | |
| 117 | /* |
| 118 | * coherent_kern_range(start, end) |
| 119 | * |
| 120 | * Ensure coherency between the Icache and the Dcache in the |
| 121 | * region described by start, end. If you have non-snooping |
| 122 | * Harvard caches, you need to implement this function. |
| 123 | * |
| 124 | * - start - virtual start address |
| 125 | * - end - virtual end address |
| 126 | */ |
| 127 | ENTRY(arm940_coherent_kern_range) |
| 128 | /* FALLTHROUGH */ |
| 129 | |
| 130 | /* |
| 131 | * coherent_user_range(start, end) |
| 132 | * |
| 133 | * Ensure coherency between the Icache and the Dcache in the |
| 134 | * region described by start, end. If you have non-snooping |
| 135 | * Harvard caches, you need to implement this function. |
| 136 | * |
| 137 | * - start - virtual start address |
| 138 | * - end - virtual end address |
| 139 | */ |
| 140 | ENTRY(arm940_coherent_user_range) |
| 141 | /* FALLTHROUGH */ |
| 142 | |
| 143 | /* |
Russell King | 2c9b9c8 | 2009-11-26 12:56:21 +0000 | [diff] [blame] | 144 | * flush_kern_dcache_area(void *addr, size_t size) |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 145 | * |
| 146 | * Ensure no D cache aliasing occurs, either with itself or |
| 147 | * the I cache |
| 148 | * |
Russell King | 2c9b9c8 | 2009-11-26 12:56:21 +0000 | [diff] [blame] | 149 | * - addr - kernel address |
| 150 | * - size - region size |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 151 | */ |
Russell King | 2c9b9c8 | 2009-11-26 12:56:21 +0000 | [diff] [blame] | 152 | ENTRY(arm940_flush_kern_dcache_area) |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 153 | mov ip, #0 |
| 154 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments |
| 155 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries |
| 156 | 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index |
| 157 | subs r3, r3, #1 << 26 |
| 158 | bcs 2b @ entries 63 to 0 |
| 159 | subs r1, r1, #1 << 4 |
| 160 | bcs 1b @ segments 7 to 0 |
| 161 | mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| 162 | mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| 163 | mov pc, lr |
| 164 | |
| 165 | /* |
| 166 | * dma_inv_range(start, end) |
| 167 | * |
| 168 | * There is no efficient way to invalidate a specifid virtual |
| 169 | * address range. Thus, invalidates all. |
| 170 | * |
| 171 | * - start - virtual start address |
| 172 | * - end - virtual end address |
| 173 | */ |
Russell King | 702b94b | 2009-11-26 16:24:19 +0000 | [diff] [blame] | 174 | arm940_dma_inv_range: |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 175 | mov ip, #0 |
| 176 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments |
| 177 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries |
| 178 | 2: mcr p15, 0, r3, c7, c6, 2 @ flush D entry |
| 179 | subs r3, r3, #1 << 26 |
| 180 | bcs 2b @ entries 63 to 0 |
| 181 | subs r1, r1, #1 << 4 |
| 182 | bcs 1b @ segments 7 to 0 |
| 183 | mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| 184 | mov pc, lr |
| 185 | |
| 186 | /* |
| 187 | * dma_clean_range(start, end) |
| 188 | * |
| 189 | * There is no efficient way to clean a specifid virtual |
| 190 | * address range. Thus, cleans all. |
| 191 | * |
| 192 | * - start - virtual start address |
| 193 | * - end - virtual end address |
| 194 | */ |
Russell King | 702b94b | 2009-11-26 16:24:19 +0000 | [diff] [blame] | 195 | arm940_dma_clean_range: |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 196 | ENTRY(cpu_arm940_dcache_clean_area) |
| 197 | mov ip, #0 |
| 198 | #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
| 199 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments |
| 200 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries |
| 201 | 2: mcr p15, 0, r3, c7, c10, 2 @ clean D entry |
| 202 | subs r3, r3, #1 << 26 |
| 203 | bcs 2b @ entries 63 to 0 |
| 204 | subs r1, r1, #1 << 4 |
| 205 | bcs 1b @ segments 7 to 0 |
| 206 | #endif |
| 207 | mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| 208 | mov pc, lr |
| 209 | |
| 210 | /* |
| 211 | * dma_flush_range(start, end) |
| 212 | * |
| 213 | * There is no efficient way to clean and invalidate a specifid |
| 214 | * virtual address range. |
| 215 | * |
| 216 | * - start - virtual start address |
| 217 | * - end - virtual end address |
| 218 | */ |
| 219 | ENTRY(arm940_dma_flush_range) |
| 220 | mov ip, #0 |
| 221 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments |
| 222 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries |
| 223 | 2: |
| 224 | #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
| 225 | mcr p15, 0, r3, c7, c14, 2 @ clean/flush D entry |
| 226 | #else |
Lennert Buytenhek | b3a8b75 | 2008-05-10 21:05:31 +0100 | [diff] [blame] | 227 | mcr p15, 0, r3, c7, c6, 2 @ invalidate D entry |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 228 | #endif |
| 229 | subs r3, r3, #1 << 26 |
| 230 | bcs 2b @ entries 63 to 0 |
| 231 | subs r1, r1, #1 << 4 |
| 232 | bcs 1b @ segments 7 to 0 |
| 233 | mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| 234 | mov pc, lr |
| 235 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 236 | /* |
| 237 | * dma_map_area(start, size, dir) |
| 238 | * - start - kernel virtual start address |
| 239 | * - size - size of region |
| 240 | * - dir - DMA direction |
| 241 | */ |
| 242 | ENTRY(arm940_dma_map_area) |
| 243 | add r1, r1, r0 |
| 244 | cmp r2, #DMA_TO_DEVICE |
| 245 | beq arm940_dma_clean_range |
| 246 | bcs arm940_dma_inv_range |
| 247 | b arm940_dma_flush_range |
| 248 | ENDPROC(arm940_dma_map_area) |
| 249 | |
| 250 | /* |
| 251 | * dma_unmap_area(start, size, dir) |
| 252 | * - start - kernel virtual start address |
| 253 | * - size - size of region |
| 254 | * - dir - DMA direction |
| 255 | */ |
| 256 | ENTRY(arm940_dma_unmap_area) |
| 257 | mov pc, lr |
| 258 | ENDPROC(arm940_dma_unmap_area) |
| 259 | |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 260 | ENTRY(arm940_cache_fns) |
| 261 | .long arm940_flush_kern_cache_all |
| 262 | .long arm940_flush_user_cache_all |
| 263 | .long arm940_flush_user_cache_range |
| 264 | .long arm940_coherent_kern_range |
| 265 | .long arm940_coherent_user_range |
Russell King | 2c9b9c8 | 2009-11-26 12:56:21 +0000 | [diff] [blame] | 266 | .long arm940_flush_kern_dcache_area |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 267 | .long arm940_dma_map_area |
| 268 | .long arm940_dma_unmap_area |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 269 | .long arm940_dma_flush_range |
| 270 | |
| 271 | __INIT |
| 272 | |
| 273 | .type __arm940_setup, #function |
| 274 | __arm940_setup: |
| 275 | mov r0, #0 |
| 276 | mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache |
| 277 | mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache |
| 278 | mcr p15, 0, r0, c7, c10, 4 @ drain WB |
| 279 | |
| 280 | mcr p15, 0, r0, c6, c3, 0 @ disable data area 3~7 |
| 281 | mcr p15, 0, r0, c6, c4, 0 |
| 282 | mcr p15, 0, r0, c6, c5, 0 |
| 283 | mcr p15, 0, r0, c6, c6, 0 |
| 284 | mcr p15, 0, r0, c6, c7, 0 |
| 285 | |
| 286 | mcr p15, 0, r0, c6, c3, 1 @ disable instruction area 3~7 |
| 287 | mcr p15, 0, r0, c6, c4, 1 |
| 288 | mcr p15, 0, r0, c6, c5, 1 |
| 289 | mcr p15, 0, r0, c6, c6, 1 |
| 290 | mcr p15, 0, r0, c6, c7, 1 |
| 291 | |
| 292 | mov r0, #0x0000003F @ base = 0, size = 4GB |
| 293 | mcr p15, 0, r0, c6, c0, 0 @ set area 0, default |
| 294 | mcr p15, 0, r0, c6, c0, 1 |
| 295 | |
| 296 | ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM |
| 297 | ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB) |
| 298 | mov r2, #10 @ 11 is the minimum (4KB) |
| 299 | 1: add r2, r2, #1 @ area size *= 2 |
| 300 | mov r1, r1, lsr #1 |
| 301 | bne 1b @ count not zero r-shift |
| 302 | orr r0, r0, r2, lsl #1 @ the area register value |
| 303 | orr r0, r0, #1 @ set enable bit |
| 304 | mcr p15, 0, r0, c6, c1, 0 @ set area 1, RAM |
| 305 | mcr p15, 0, r0, c6, c1, 1 |
| 306 | |
| 307 | ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH |
| 308 | ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB) |
| 309 | mov r2, #10 @ 11 is the minimum (4KB) |
| 310 | 1: add r2, r2, #1 @ area size *= 2 |
| 311 | mov r1, r1, lsr #1 |
| 312 | bne 1b @ count not zero r-shift |
| 313 | orr r0, r0, r2, lsl #1 @ the area register value |
| 314 | orr r0, r0, #1 @ set enable bit |
| 315 | mcr p15, 0, r0, c6, c2, 0 @ set area 2, ROM/FLASH |
| 316 | mcr p15, 0, r0, c6, c2, 1 |
| 317 | |
| 318 | mov r0, #0x06 |
| 319 | mcr p15, 0, r0, c2, c0, 0 @ Region 1&2 cacheable |
| 320 | mcr p15, 0, r0, c2, c0, 1 |
| 321 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| 322 | mov r0, #0x00 @ disable whole write buffer |
| 323 | #else |
| 324 | mov r0, #0x02 @ Region 1 write bufferred |
| 325 | #endif |
| 326 | mcr p15, 0, r0, c3, c0, 0 |
| 327 | |
| 328 | mov r0, #0x10000 |
| 329 | sub r0, r0, #1 @ r0 = 0xffff |
| 330 | mcr p15, 0, r0, c5, c0, 0 @ all read/write access |
| 331 | mcr p15, 0, r0, c5, c0, 1 |
| 332 | |
| 333 | mrc p15, 0, r0, c1, c0 @ get control register |
| 334 | orr r0, r0, #0x00001000 @ I-cache |
| 335 | orr r0, r0, #0x00000005 @ MPU/D-cache |
| 336 | |
| 337 | mov pc, lr |
| 338 | |
| 339 | .size __arm940_setup, . - __arm940_setup |
| 340 | |
| 341 | __INITDATA |
| 342 | |
| 343 | /* |
| 344 | * Purpose : Function pointers used to access above functions - all calls |
| 345 | * come through these |
| 346 | */ |
| 347 | .type arm940_processor_functions, #object |
| 348 | ENTRY(arm940_processor_functions) |
Hyok S. Choi | 0f45d7f | 2006-09-28 21:46:16 +0900 | [diff] [blame] | 349 | .word nommu_early_abort |
Kirill A. Shutemov | 4fb2847 | 2009-09-25 13:39:47 +0100 | [diff] [blame] | 350 | .word legacy_pabort |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 351 | .word cpu_arm940_proc_init |
| 352 | .word cpu_arm940_proc_fin |
| 353 | .word cpu_arm940_reset |
| 354 | .word cpu_arm940_do_idle |
| 355 | .word cpu_arm940_dcache_clean_area |
| 356 | .word cpu_arm940_switch_mm |
| 357 | .word 0 @ cpu_*_set_pte |
| 358 | .size arm940_processor_functions, . - arm940_processor_functions |
| 359 | |
| 360 | .section ".rodata" |
| 361 | |
| 362 | .type cpu_arch_name, #object |
| 363 | cpu_arch_name: |
| 364 | .asciz "armv4t" |
| 365 | .size cpu_arch_name, . - cpu_arch_name |
| 366 | |
| 367 | .type cpu_elf_name, #object |
| 368 | cpu_elf_name: |
| 369 | .asciz "v4" |
| 370 | .size cpu_elf_name, . - cpu_elf_name |
| 371 | |
| 372 | .type cpu_arm940_name, #object |
| 373 | cpu_arm940_name: |
| 374 | .ascii "ARM940T" |
| 375 | .size cpu_arm940_name, . - cpu_arm940_name |
| 376 | |
| 377 | .align |
| 378 | |
| 379 | .section ".proc.info.init", #alloc, #execinstr |
| 380 | |
| 381 | .type __arm940_proc_info,#object |
| 382 | __arm940_proc_info: |
| 383 | .long 0x41009400 |
| 384 | .long 0xff00fff0 |
| 385 | .long 0 |
| 386 | b __arm940_setup |
| 387 | .long cpu_arch_name |
| 388 | .long cpu_elf_name |
| 389 | .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB |
| 390 | .long cpu_arm940_name |
| 391 | .long arm940_processor_functions |
| 392 | .long 0 |
| 393 | .long 0 |
| 394 | .long arm940_cache_fns |
| 395 | .size __arm940_proc_info, . - __arm940_proc_info |
| 396 | |