Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mm/proc-sa1100.S |
| 3 | * |
| 4 | * Copyright (C) 1997-2002 Russell King |
| 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 | * MMU functions for SA110 |
| 11 | * |
| 12 | * These are the low level assembler for performing cache and TLB |
| 13 | * functions on the StrongARM-1100 and StrongARM-1110. |
| 14 | * |
| 15 | * Note that SA1100 and SA1110 share everything but their name and CPU ID. |
| 16 | * |
| 17 | * 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl): |
| 18 | * Flush the read buffer at context switches |
| 19 | */ |
| 20 | #include <linux/linkage.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <asm/assembler.h> |
Sam Ravnborg | e6ae744 | 2005-09-09 21:08:59 +0200 | [diff] [blame] | 23 | #include <asm/asm-offsets.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/procinfo.h> |
| 25 | #include <asm/hardware.h> |
Russell King | 74945c8 | 2006-03-16 14:44:36 +0000 | [diff] [blame] | 26 | #include <asm/pgtable-hwdef.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <asm/pgtable.h> |
| 28 | |
| 29 | /* |
| 30 | * the cache line size of the I and D cache |
| 31 | */ |
| 32 | #define DCACHELINESIZE 32 |
| 33 | #define FLUSH_OFFSET 32768 |
| 34 | |
| 35 | .macro flush_1100_dcache rd, ra, re |
| 36 | ldr \rd, =flush_base |
| 37 | ldr \ra, [\rd] |
| 38 | eor \ra, \ra, #FLUSH_OFFSET |
| 39 | str \ra, [\rd] |
| 40 | add \re, \ra, #8192 @ only necessary for 8k |
| 41 | 1001: ldr \rd, [\ra], #DCACHELINESIZE |
| 42 | teq \re, \ra |
| 43 | bne 1001b |
| 44 | #ifdef FLUSH_BASE_MINICACHE |
| 45 | add \ra, \ra, #FLUSH_BASE_MINICACHE - FLUSH_BASE |
| 46 | add \re, \ra, #512 @ only 512 bytes |
| 47 | 1002: ldr \rd, [\ra], #DCACHELINESIZE |
| 48 | teq \re, \ra |
| 49 | bne 1002b |
| 50 | #endif |
| 51 | .endm |
| 52 | |
| 53 | .data |
| 54 | flush_base: |
| 55 | .long FLUSH_BASE |
| 56 | .text |
| 57 | |
| 58 | __INIT |
| 59 | |
| 60 | /* |
| 61 | * cpu_sa1100_proc_init() |
| 62 | */ |
| 63 | ENTRY(cpu_sa1100_proc_init) |
| 64 | mov r0, #0 |
| 65 | mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching |
| 66 | mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland |
| 67 | mov pc, lr |
| 68 | |
| 69 | .previous |
| 70 | |
| 71 | /* |
| 72 | * cpu_sa1100_proc_fin() |
| 73 | * |
| 74 | * Prepare the CPU for reset: |
| 75 | * - Disable interrupts |
| 76 | * - Clean and turn off caches. |
| 77 | */ |
| 78 | ENTRY(cpu_sa1100_proc_fin) |
| 79 | stmfd sp!, {lr} |
| 80 | mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE |
| 81 | msr cpsr_c, ip |
| 82 | flush_1100_dcache r0, r1, r2 @ clean caches |
| 83 | mov r0, #0 |
| 84 | mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching |
| 85 | mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
| 86 | bic r0, r0, #0x1000 @ ...i............ |
| 87 | bic r0, r0, #0x000e @ ............wca. |
| 88 | mcr p15, 0, r0, c1, c0, 0 @ disable caches |
| 89 | ldmfd sp!, {pc} |
| 90 | |
| 91 | /* |
| 92 | * cpu_sa1100_reset(loc) |
| 93 | * |
| 94 | * Perform a soft reset of the system. Put the CPU into the |
| 95 | * same state as it would be if it had been reset, and branch |
| 96 | * to what would be the reset vector. |
| 97 | * |
| 98 | * loc: location to jump to for soft reset |
| 99 | */ |
| 100 | .align 5 |
| 101 | ENTRY(cpu_sa1100_reset) |
| 102 | mov ip, #0 |
| 103 | mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches |
| 104 | mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| 105 | mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs |
| 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 |
| 111 | |
| 112 | /* |
| 113 | * cpu_sa1100_do_idle(type) |
| 114 | * |
| 115 | * Cause the processor to idle |
| 116 | * |
| 117 | * type: call type: |
| 118 | * 0 = slow idle |
| 119 | * 1 = fast idle |
| 120 | * 2 = switch to slow processor clock |
| 121 | * 3 = switch to fast processor clock |
| 122 | */ |
| 123 | .align 5 |
| 124 | ENTRY(cpu_sa1100_do_idle) |
| 125 | mov r0, r0 @ 4 nop padding |
| 126 | mov r0, r0 |
| 127 | mov r0, r0 |
| 128 | mov r0, r0 @ 4 nop padding |
| 129 | mov r0, r0 |
| 130 | mov r0, r0 |
| 131 | mov r0, #0 |
| 132 | ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address |
| 133 | @ --- aligned to a cache line |
| 134 | mcr p15, 0, r0, c15, c2, 2 @ disable clock switching |
| 135 | ldr r1, [r1, #0] @ force switch to MCLK |
| 136 | mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt |
| 137 | mov r0, r0 @ safety |
| 138 | mcr p15, 0, r0, c15, c1, 2 @ enable clock switching |
| 139 | mov pc, lr |
| 140 | |
| 141 | /* ================================= CACHE ================================ */ |
| 142 | |
| 143 | /* |
| 144 | * cpu_sa1100_dcache_clean_area(addr,sz) |
| 145 | * |
| 146 | * Clean the specified entry of any caches such that the MMU |
| 147 | * translation fetches will obtain correct data. |
| 148 | * |
| 149 | * addr: cache-unaligned virtual address |
| 150 | */ |
| 151 | .align 5 |
| 152 | ENTRY(cpu_sa1100_dcache_clean_area) |
| 153 | 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| 154 | add r0, r0, #DCACHELINESIZE |
| 155 | subs r1, r1, #DCACHELINESIZE |
| 156 | bhi 1b |
| 157 | mov pc, lr |
| 158 | |
| 159 | /* =============================== PageTable ============================== */ |
| 160 | |
| 161 | /* |
| 162 | * cpu_sa1100_switch_mm(pgd) |
| 163 | * |
| 164 | * Set the translation base pointer to be as described by pgd. |
| 165 | * |
| 166 | * pgd: new page tables |
| 167 | */ |
| 168 | .align 5 |
| 169 | ENTRY(cpu_sa1100_switch_mm) |
| 170 | flush_1100_dcache r3, ip, r1 |
| 171 | mov ip, #0 |
| 172 | mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| 173 | mcr p15, 0, ip, c9, c0, 0 @ invalidate RB |
| 174 | mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| 175 | mcr p15, 0, r0, c2, c0, 0 @ load page table pointer |
| 176 | mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs |
| 177 | mov pc, lr |
| 178 | |
| 179 | /* |
| 180 | * cpu_sa1100_set_pte(ptep, pte) |
| 181 | * |
| 182 | * Set a PTE and flush it out |
| 183 | */ |
| 184 | .align 5 |
| 185 | ENTRY(cpu_sa1100_set_pte) |
| 186 | str r1, [r0], #-2048 @ linux version |
| 187 | |
| 188 | eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY |
| 189 | |
| 190 | bic r2, r1, #PTE_SMALL_AP_MASK |
| 191 | bic r2, r2, #PTE_TYPE_MASK |
| 192 | orr r2, r2, #PTE_TYPE_SMALL |
| 193 | |
| 194 | tst r1, #L_PTE_USER @ User? |
| 195 | orrne r2, r2, #PTE_SMALL_AP_URO_SRW |
| 196 | |
| 197 | tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty? |
| 198 | orreq r2, r2, #PTE_SMALL_AP_UNO_SRW |
| 199 | |
| 200 | tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young? |
| 201 | movne r2, #0 |
| 202 | |
| 203 | str r2, [r0] @ hardware version |
| 204 | mov r0, r0 |
| 205 | mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| 206 | mcr p15, 0, r0, c7, c10, 4 @ drain WB |
| 207 | mov pc, lr |
| 208 | |
| 209 | __INIT |
| 210 | |
| 211 | .type __sa1100_setup, #function |
| 212 | __sa1100_setup: |
| 213 | mov r0, #0 |
| 214 | mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 |
| 215 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 |
| 216 | mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 |
| 217 | mrc p15, 0, r0, c1, c0 @ get control register v4 |
| 218 | ldr r5, sa1100_cr1_clear |
| 219 | bic r0, r0, r5 |
| 220 | ldr r5, sa1100_cr1_set |
| 221 | orr r0, r0, r5 |
| 222 | mov pc, lr |
| 223 | .size __sa1100_setup, . - __sa1100_setup |
| 224 | |
| 225 | /* |
| 226 | * R |
| 227 | * .RVI ZFRS BLDP WCAM |
| 228 | * ..11 0001 ..11 1101 |
| 229 | * |
| 230 | */ |
| 231 | .type sa1100_cr1_clear, #object |
| 232 | .type sa1100_cr1_set, #object |
| 233 | sa1100_cr1_clear: |
| 234 | .word 0x3f3f |
| 235 | sa1100_cr1_set: |
| 236 | .word 0x313d |
| 237 | |
| 238 | __INITDATA |
| 239 | |
| 240 | /* |
| 241 | * Purpose : Function pointers used to access above functions - all calls |
| 242 | * come through these |
| 243 | */ |
| 244 | |
| 245 | /* |
| 246 | * SA1100 and SA1110 share the same function calls |
| 247 | */ |
| 248 | .type sa1100_processor_functions, #object |
| 249 | ENTRY(sa1100_processor_functions) |
| 250 | .word v4_early_abort |
| 251 | .word cpu_sa1100_proc_init |
| 252 | .word cpu_sa1100_proc_fin |
| 253 | .word cpu_sa1100_reset |
| 254 | .word cpu_sa1100_do_idle |
| 255 | .word cpu_sa1100_dcache_clean_area |
| 256 | .word cpu_sa1100_switch_mm |
| 257 | .word cpu_sa1100_set_pte |
| 258 | .size sa1100_processor_functions, . - sa1100_processor_functions |
| 259 | |
| 260 | .section ".rodata" |
| 261 | |
| 262 | .type cpu_arch_name, #object |
| 263 | cpu_arch_name: |
| 264 | .asciz "armv4" |
| 265 | .size cpu_arch_name, . - cpu_arch_name |
| 266 | |
| 267 | .type cpu_elf_name, #object |
| 268 | cpu_elf_name: |
| 269 | .asciz "v4" |
| 270 | .size cpu_elf_name, . - cpu_elf_name |
| 271 | |
| 272 | .type cpu_sa1100_name, #object |
| 273 | cpu_sa1100_name: |
| 274 | .asciz "StrongARM-1100" |
| 275 | .size cpu_sa1100_name, . - cpu_sa1100_name |
| 276 | |
| 277 | .type cpu_sa1110_name, #object |
| 278 | cpu_sa1110_name: |
| 279 | .asciz "StrongARM-1110" |
| 280 | .size cpu_sa1110_name, . - cpu_sa1110_name |
| 281 | |
| 282 | .align |
| 283 | |
Ben Dooks | 02b7dd1 | 2005-09-20 16:35:03 +0100 | [diff] [blame] | 284 | .section ".proc.info.init", #alloc, #execinstr |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | .type __sa1100_proc_info,#object |
| 287 | __sa1100_proc_info: |
| 288 | .long 0x4401a110 |
| 289 | .long 0xfffffff0 |
| 290 | .long PMD_TYPE_SECT | \ |
| 291 | PMD_SECT_BUFFERABLE | \ |
| 292 | PMD_SECT_CACHEABLE | \ |
| 293 | PMD_SECT_AP_WRITE | \ |
| 294 | PMD_SECT_AP_READ |
| 295 | b __sa1100_setup |
| 296 | .long cpu_arch_name |
| 297 | .long cpu_elf_name |
| 298 | .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT |
| 299 | .long cpu_sa1100_name |
| 300 | .long sa1100_processor_functions |
| 301 | .long v4wb_tlb_fns |
| 302 | .long v4_mc_user_fns |
| 303 | .long v4wb_cache_fns |
| 304 | .size __sa1100_proc_info, . - __sa1100_proc_info |
| 305 | |
| 306 | .type __sa1110_proc_info,#object |
| 307 | __sa1110_proc_info: |
| 308 | .long 0x6901b110 |
| 309 | .long 0xfffffff0 |
| 310 | .long PMD_TYPE_SECT | \ |
| 311 | PMD_SECT_BUFFERABLE | \ |
| 312 | PMD_SECT_CACHEABLE | \ |
| 313 | PMD_SECT_AP_WRITE | \ |
| 314 | PMD_SECT_AP_READ |
| 315 | b __sa1100_setup |
| 316 | .long cpu_arch_name |
| 317 | .long cpu_elf_name |
| 318 | .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT |
| 319 | .long cpu_sa1110_name |
| 320 | .long sa1100_processor_functions |
| 321 | .long v4wb_tlb_fns |
| 322 | .long v4_mc_user_fns |
| 323 | .long v4wb_cache_fns |
| 324 | .size __sa1110_proc_info, . - __sa1110_proc_info |