1/* 2 * linux/arch/arm/mm/proc-sa1100.S 3 * 4 * Copyright (C) 1997-2002 Russell King 5 * hacked for non-paged-MM by Hyok S. Choi, 2003. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * MMU functions for SA110 12 * 13 * These are the low level assembler for performing cache and TLB 14 * functions on the StrongARM-1100 and StrongARM-1110. 15 * 16 * Note that SA1100 and SA1110 share everything but their name and CPU ID. 17 * 18 * 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl): 19 * Flush the read buffer at context switches 20 */ 21#include <linux/linkage.h> 22#include <linux/init.h> 23#include <asm/assembler.h> 24#include <asm/asm-offsets.h> 25#include <asm/hwcap.h> 26#include <mach/hardware.h> 27#include <asm/pgtable-hwdef.h> 28#include <asm/pgtable.h> 29 30#include "proc-macros.S" 31 32/* 33 * the cache line size of the I and D cache 34 */ 35#define DCACHELINESIZE 32 36 37 __INIT 38 39/* 40 * cpu_sa1100_proc_init() 41 */ 42ENTRY(cpu_sa1100_proc_init) 43 mov r0, #0 44 mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching 45 mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland 46 mov pc, lr 47 48 .section .text 49 50/* 51 * cpu_sa1100_proc_fin() 52 * 53 * Prepare the CPU for reset: 54 * - Disable interrupts 55 * - Clean and turn off caches. 56 */ 57ENTRY(cpu_sa1100_proc_fin) 58 mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching 59 mrc p15, 0, r0, c1, c0, 0 @ ctrl register 60 bic r0, r0, #0x1000 @ ...i............ 61 bic r0, r0, #0x000e @ ............wca. 62 mcr p15, 0, r0, c1, c0, 0 @ disable caches 63 mov pc, lr 64 65/* 66 * cpu_sa1100_reset(loc) 67 * 68 * Perform a soft reset of the system. Put the CPU into the 69 * same state as it would be if it had been reset, and branch 70 * to what would be the reset vector. 71 * 72 * loc: location to jump to for soft reset 73 */ 74 .align 5 75ENTRY(cpu_sa1100_reset) 76 mov ip, #0 77 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches 78 mcr p15, 0, ip, c7, c10, 4 @ drain WB 79#ifdef CONFIG_MMU 80 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 81#endif 82 mrc p15, 0, ip, c1, c0, 0 @ ctrl register 83 bic ip, ip, #0x000f @ ............wcam 84 bic ip, ip, #0x1100 @ ...i...s........ 85 mcr p15, 0, ip, c1, c0, 0 @ ctrl register 86 mov pc, r0 87 88/* 89 * cpu_sa1100_do_idle(type) 90 * 91 * Cause the processor to idle 92 * 93 * type: call type: 94 * 0 = slow idle 95 * 1 = fast idle 96 * 2 = switch to slow processor clock 97 * 3 = switch to fast processor clock 98 */ 99 .align 5 100ENTRY(cpu_sa1100_do_idle) 101 mov r0, r0 @ 4 nop padding 102 mov r0, r0 103 mov r0, r0 104 mov r0, r0 @ 4 nop padding 105 mov r0, r0 106 mov r0, r0 107 mov r0, #0 108 ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address 109 @ --- aligned to a cache line 110 mcr p15, 0, r0, c15, c2, 2 @ disable clock switching 111 ldr r1, [r1, #0] @ force switch to MCLK 112 mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt 113 mov r0, r0 @ safety 114 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching 115 mov pc, lr 116 117/* ================================= CACHE ================================ */ 118 119/* 120 * cpu_sa1100_dcache_clean_area(addr,sz) 121 * 122 * Clean the specified entry of any caches such that the MMU 123 * translation fetches will obtain correct data. 124 * 125 * addr: cache-unaligned virtual address 126 */ 127 .align 5 128ENTRY(cpu_sa1100_dcache_clean_area) 1291: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 130 add r0, r0, #DCACHELINESIZE 131 subs r1, r1, #DCACHELINESIZE 132 bhi 1b 133 mov pc, lr 134 135/* =============================== PageTable ============================== */ 136 137/* 138 * cpu_sa1100_switch_mm(pgd) 139 * 140 * Set the translation base pointer to be as described by pgd. 141 * 142 * pgd: new page tables 143 */ 144 .align 5 145ENTRY(cpu_sa1100_switch_mm) 146#ifdef CONFIG_MMU 147 str lr, [sp, #-4]! 148 bl v4wb_flush_kern_cache_all @ clears IP 149 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB 150 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 151 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 152 ldr pc, [sp], #4 153#else 154 mov pc, lr 155#endif 156 157/* 158 * cpu_sa1100_set_pte_ext(ptep, pte, ext) 159 * 160 * Set a PTE and flush it out 161 */ 162 .align 5 163ENTRY(cpu_sa1100_set_pte_ext) 164#ifdef CONFIG_MMU 165 armv3_set_pte_ext wc_disable=0 166 mov r0, r0 167 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 168 mcr p15, 0, r0, c7, c10, 4 @ drain WB 169#endif 170 mov pc, lr 171 172.globl cpu_sa1100_suspend_size 173.equ cpu_sa1100_suspend_size, 4*4 174#ifdef CONFIG_PM 175ENTRY(cpu_sa1100_do_suspend) 176 stmfd sp!, {r4 - r7, lr} 177 mrc p15, 0, r4, c3, c0, 0 @ domain ID 178 mrc p15, 0, r5, c2, c0, 0 @ translation table base addr 179 mrc p15, 0, r6, c13, c0, 0 @ PID 180 mrc p15, 0, r7, c1, c0, 0 @ control reg 181 stmia r0, {r4 - r7} @ store cp regs 182 ldmfd sp!, {r4 - r7, pc} 183ENDPROC(cpu_sa1100_do_suspend) 184 185ENTRY(cpu_sa1100_do_resume) 186 ldmia r0, {r4 - r7} @ load cp regs 187 mov r1, #0 188 mcr p15, 0, r1, c8, c7, 0 @ flush I+D TLBs 189 mcr p15, 0, r1, c7, c7, 0 @ flush I&D cache 190 mcr p15, 0, r1, c9, c0, 0 @ invalidate RB 191 mcr p15, 0, r1, c9, c0, 5 @ allow user space to use RB 192 193 mcr p15, 0, r4, c3, c0, 0 @ domain ID 194 mcr p15, 0, r5, c2, c0, 0 @ translation table base addr 195 mcr p15, 0, r6, c13, c0, 0 @ PID 196 mov r0, r7 @ control register 197 mov r2, r5, lsr #14 @ get TTB0 base 198 mov r2, r2, lsl #14 199 ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \ 200 PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE 201 b cpu_resume_mmu 202ENDPROC(cpu_sa1100_do_resume) 203#else 204#define cpu_sa1100_do_suspend 0 205#define cpu_sa1100_do_resume 0 206#endif 207 208 __CPUINIT 209 210 .type __sa1100_setup, #function 211__sa1100_setup: 212 mov r0, #0 213 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 214 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 215#ifdef CONFIG_MMU 216 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 217#endif 218 adr r5, sa1100_crval 219 ldmia r5, {r5, r6} 220 mrc p15, 0, r0, c1, c0 @ get control register v4 221 bic r0, r0, r5 222 orr r0, r0, r6 223 mov pc, lr 224 .size __sa1100_setup, . - __sa1100_setup 225 226 /* 227 * R 228 * .RVI ZFRS BLDP WCAM 229 * ..11 0001 ..11 1101 230 * 231 */ 232 .type sa1100_crval, #object 233sa1100_crval: 234 crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130 235 236 __INITDATA 237 238/* 239 * Purpose : Function pointers used to access above functions - all calls 240 * come through these 241 */ 242 243/* 244 * SA1100 and SA1110 share the same function calls 245 */ 246 .type sa1100_processor_functions, #object 247ENTRY(sa1100_processor_functions) 248 .word v4_early_abort 249 .word legacy_pabort 250 .word cpu_sa1100_proc_init 251 .word cpu_sa1100_proc_fin 252 .word cpu_sa1100_reset 253 .word cpu_sa1100_do_idle 254 .word cpu_sa1100_dcache_clean_area 255 .word cpu_sa1100_switch_mm 256 .word cpu_sa1100_set_pte_ext 257 .word cpu_sa1100_suspend_size 258 .word cpu_sa1100_do_suspend 259 .word cpu_sa1100_do_resume 260 .size sa1100_processor_functions, . - sa1100_processor_functions 261 262 .section ".rodata" 263 264 .type cpu_arch_name, #object 265cpu_arch_name: 266 .asciz "armv4" 267 .size cpu_arch_name, . - cpu_arch_name 268 269 .type cpu_elf_name, #object 270cpu_elf_name: 271 .asciz "v4" 272 .size cpu_elf_name, . - cpu_elf_name 273 274 .type cpu_sa1100_name, #object 275cpu_sa1100_name: 276 .asciz "StrongARM-1100" 277 .size cpu_sa1100_name, . - cpu_sa1100_name 278 279 .type cpu_sa1110_name, #object 280cpu_sa1110_name: 281 .asciz "StrongARM-1110" 282 .size cpu_sa1110_name, . - cpu_sa1110_name 283 284 .align 285 286 .section ".proc.info.init", #alloc, #execinstr 287 288 .type __sa1100_proc_info,#object 289__sa1100_proc_info: 290 .long 0x4401a110 291 .long 0xfffffff0 292 .long PMD_TYPE_SECT | \ 293 PMD_SECT_BUFFERABLE | \ 294 PMD_SECT_CACHEABLE | \ 295 PMD_SECT_AP_WRITE | \ 296 PMD_SECT_AP_READ 297 .long PMD_TYPE_SECT | \ 298 PMD_SECT_AP_WRITE | \ 299 PMD_SECT_AP_READ 300 b __sa1100_setup 301 .long cpu_arch_name 302 .long cpu_elf_name 303 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT 304 .long cpu_sa1100_name 305 .long sa1100_processor_functions 306 .long v4wb_tlb_fns 307 .long v4_mc_user_fns 308 .long v4wb_cache_fns 309 .size __sa1100_proc_info, . - __sa1100_proc_info 310 311 .type __sa1110_proc_info,#object 312__sa1110_proc_info: 313 .long 0x6901b110 314 .long 0xfffffff0 315 .long PMD_TYPE_SECT | \ 316 PMD_SECT_BUFFERABLE | \ 317 PMD_SECT_CACHEABLE | \ 318 PMD_SECT_AP_WRITE | \ 319 PMD_SECT_AP_READ 320 .long PMD_TYPE_SECT | \ 321 PMD_SECT_AP_WRITE | \ 322 PMD_SECT_AP_READ 323 b __sa1100_setup 324 .long cpu_arch_name 325 .long cpu_elf_name 326 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT 327 .long cpu_sa1110_name 328 .long sa1100_processor_functions 329 .long v4wb_tlb_fns 330 .long v4_mc_user_fns 331 .long v4wb_cache_fns 332 .size __sa1110_proc_info, . - __sa1110_proc_info 333