1/* 2 * This file contains sleep low-level functions for PowerBook G3. 3 * Copyright (C) 1999 Benjamin Herrenschmidt (benh@kernel.crashing.org) 4 * and Paul Mackerras (paulus@samba.org). 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 * 11 */ 12 13#include <asm/processor.h> 14#include <asm/page.h> 15#include <asm/ppc_asm.h> 16#include <asm/cputable.h> 17#include <asm/cache.h> 18#include <asm/thread_info.h> 19#include <asm/asm-offsets.h> 20#include <asm/mmu.h> 21 22#define MAGIC 0x4c617273 /* 'Lars' */ 23 24/* 25 * Structure for storing CPU registers on the stack. 26 */ 27#define SL_SP 0 28#define SL_PC 4 29#define SL_MSR 8 30#define SL_SDR1 0xc 31#define SL_SPRG0 0x10 /* 4 sprg's */ 32#define SL_DBAT0 0x20 33#define SL_IBAT0 0x28 34#define SL_DBAT1 0x30 35#define SL_IBAT1 0x38 36#define SL_DBAT2 0x40 37#define SL_IBAT2 0x48 38#define SL_DBAT3 0x50 39#define SL_IBAT3 0x58 40#define SL_TB 0x60 41#define SL_R2 0x68 42#define SL_CR 0x6c 43#define SL_R12 0x70 /* r12 to r31 */ 44#define SL_SIZE (SL_R12 + 80) 45 46 .section .text 47 .align 5 48 49#if defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ_PMAC) || (defined(CONFIG_HOTPLUG_CPU) \ 50 && defined(CONFIG_PPC32)) 51 52/* This gets called by via-pmu.c late during the sleep process. 53 * The PMU was already send the sleep command and will shut us down 54 * soon. We need to save all that is needed and setup the wakeup 55 * vector that will be called by the ROM on wakeup 56 */ 57_GLOBAL(low_sleep_handler) 58#ifndef CONFIG_6xx 59 blr 60#else 61 mflr r0 62 stw r0,4(r1) 63 stwu r1,-SL_SIZE(r1) 64 mfcr r0 65 stw r0,SL_CR(r1) 66 stw r2,SL_R2(r1) 67 stmw r12,SL_R12(r1) 68 69 /* Save MSR & SDR1 */ 70 mfmsr r4 71 stw r4,SL_MSR(r1) 72 mfsdr1 r4 73 stw r4,SL_SDR1(r1) 74 75 /* Get a stable timebase and save it */ 761: mftbu r4 77 stw r4,SL_TB(r1) 78 mftb r5 79 stw r5,SL_TB+4(r1) 80 mftbu r3 81 cmpw r3,r4 82 bne 1b 83 84 /* Save SPRGs */ 85 mfsprg r4,0 86 stw r4,SL_SPRG0(r1) 87 mfsprg r4,1 88 stw r4,SL_SPRG0+4(r1) 89 mfsprg r4,2 90 stw r4,SL_SPRG0+8(r1) 91 mfsprg r4,3 92 stw r4,SL_SPRG0+12(r1) 93 94 /* Save BATs */ 95 mfdbatu r4,0 96 stw r4,SL_DBAT0(r1) 97 mfdbatl r4,0 98 stw r4,SL_DBAT0+4(r1) 99 mfdbatu r4,1 100 stw r4,SL_DBAT1(r1) 101 mfdbatl r4,1 102 stw r4,SL_DBAT1+4(r1) 103 mfdbatu r4,2 104 stw r4,SL_DBAT2(r1) 105 mfdbatl r4,2 106 stw r4,SL_DBAT2+4(r1) 107 mfdbatu r4,3 108 stw r4,SL_DBAT3(r1) 109 mfdbatl r4,3 110 stw r4,SL_DBAT3+4(r1) 111 mfibatu r4,0 112 stw r4,SL_IBAT0(r1) 113 mfibatl r4,0 114 stw r4,SL_IBAT0+4(r1) 115 mfibatu r4,1 116 stw r4,SL_IBAT1(r1) 117 mfibatl r4,1 118 stw r4,SL_IBAT1+4(r1) 119 mfibatu r4,2 120 stw r4,SL_IBAT2(r1) 121 mfibatl r4,2 122 stw r4,SL_IBAT2+4(r1) 123 mfibatu r4,3 124 stw r4,SL_IBAT3(r1) 125 mfibatl r4,3 126 stw r4,SL_IBAT3+4(r1) 127 128 /* Backup various CPU config stuffs */ 129 bl __save_cpu_setup 130 131 /* The ROM can wake us up via 2 different vectors: 132 * - On wallstreet & lombard, we must write a magic 133 * value 'Lars' at address 4 and a pointer to a 134 * memory location containing the PC to resume from 135 * at address 0. 136 * - On Core99, we must store the wakeup vector at 137 * address 0x80 and eventually it's parameters 138 * at address 0x84. I've have some trouble with those 139 * parameters however and I no longer use them. 140 */ 141 lis r5,grackle_wake_up@ha 142 addi r5,r5,grackle_wake_up@l 143 tophys(r5,r5) 144 stw r5,SL_PC(r1) 145 lis r4,KERNELBASE@h 146 tophys(r5,r1) 147 addi r5,r5,SL_PC 148 lis r6,MAGIC@ha 149 addi r6,r6,MAGIC@l 150 stw r5,0(r4) 151 stw r6,4(r4) 152 /* Setup stuffs at 0x80-0x84 for Core99 */ 153 lis r3,core99_wake_up@ha 154 addi r3,r3,core99_wake_up@l 155 tophys(r3,r3) 156 stw r3,0x80(r4) 157 stw r5,0x84(r4) 158 /* Store a pointer to our backup storage into 159 * a kernel global 160 */ 161 lis r3,sleep_storage@ha 162 addi r3,r3,sleep_storage@l 163 stw r5,0(r3) 164 165 .globl low_cpu_die 166low_cpu_die: 167 /* Flush & disable all caches */ 168 bl flush_disable_caches 169 170 /* Turn off data relocation. */ 171 mfmsr r3 /* Save MSR in r7 */ 172 rlwinm r3,r3,0,28,26 /* Turn off DR bit */ 173 sync 174 mtmsr r3 175 isync 176 177BEGIN_FTR_SECTION 178 sync 179 lis r3,0xfff0 180 lwz r0,0(r3) /* perform cache-inhibited load to ROM */ 181 sync /* (caches are disabled at this point) */ 182END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450) 183 184/* 185 * Set the HID0 and MSR for sleep. 186 */ 187 mfspr r2,SPRN_HID0 188 rlwinm r2,r2,0,10,7 /* clear doze, nap */ 189 oris r2,r2,HID0_SLEEP@h 190 sync 191 isync 192 mtspr SPRN_HID0,r2 193 sync 194 195/* This loop puts us back to sleep in case we have a spurrious 196 * wakeup so that the host bridge properly stays asleep. The 197 * CPU will be turned off, either after a known time (about 1 198 * second) on wallstreet & lombard, or as soon as the CPU enters 199 * SLEEP mode on core99 200 */ 201 mfmsr r2 202 oris r2,r2,MSR_POW@h 2031: sync 204 mtmsr r2 205 isync 206 b 1b 207 208/* 209 * Here is the resume code. 210 */ 211 212 213/* 214 * Core99 machines resume here 215 * r4 has the physical address of SL_PC(sp) (unused) 216 */ 217_GLOBAL(core99_wake_up) 218 /* Make sure HID0 no longer contains any sleep bit and that data cache 219 * is disabled 220 */ 221 mfspr r3,SPRN_HID0 222 rlwinm r3,r3,0,11,7 /* clear SLEEP, NAP, DOZE bits */ 223 rlwinm 3,r3,0,18,15 /* clear DCE, ICE */ 224 mtspr SPRN_HID0,r3 225 sync 226 isync 227 228 /* sanitize MSR */ 229 mfmsr r3 230 ori r3,r3,MSR_EE|MSR_IP 231 xori r3,r3,MSR_EE|MSR_IP 232 sync 233 isync 234 mtmsr r3 235 sync 236 isync 237 238 /* Recover sleep storage */ 239 lis r3,sleep_storage@ha 240 addi r3,r3,sleep_storage@l 241 tophys(r3,r3) 242 lwz r1,0(r3) 243 244 /* Pass thru to older resume code ... */ 245/* 246 * Here is the resume code for older machines. 247 * r1 has the physical address of SL_PC(sp). 248 */ 249 250grackle_wake_up: 251 252 /* Restore the kernel's segment registers before 253 * we do any r1 memory access as we are not sure they 254 * are in a sane state above the first 256Mb region 255 */ 256 li r0,16 /* load up segment register values */ 257 mtctr r0 /* for context 0 */ 258 lis r3,0x2000 /* Ku = 1, VSID = 0 */ 259 li r4,0 2603: mtsrin r3,r4 261 addi r3,r3,0x111 /* increment VSID */ 262 addis r4,r4,0x1000 /* address of next segment */ 263 bdnz 3b 264 sync 265 isync 266 267 subi r1,r1,SL_PC 268 269 /* Restore various CPU config stuffs */ 270 bl __restore_cpu_setup 271 272 /* Make sure all FPRs have been initialized */ 273 bl reloc_offset 274 bl __init_fpu_registers 275 276 /* Invalidate & enable L1 cache, we don't care about 277 * whatever the ROM may have tried to write to memory 278 */ 279 bl __inval_enable_L1 280 281 /* Restore the BATs, and SDR1. Then we can turn on the MMU. */ 282 lwz r4,SL_SDR1(r1) 283 mtsdr1 r4 284 lwz r4,SL_SPRG0(r1) 285 mtsprg 0,r4 286 lwz r4,SL_SPRG0+4(r1) 287 mtsprg 1,r4 288 lwz r4,SL_SPRG0+8(r1) 289 mtsprg 2,r4 290 lwz r4,SL_SPRG0+12(r1) 291 mtsprg 3,r4 292 293 lwz r4,SL_DBAT0(r1) 294 mtdbatu 0,r4 295 lwz r4,SL_DBAT0+4(r1) 296 mtdbatl 0,r4 297 lwz r4,SL_DBAT1(r1) 298 mtdbatu 1,r4 299 lwz r4,SL_DBAT1+4(r1) 300 mtdbatl 1,r4 301 lwz r4,SL_DBAT2(r1) 302 mtdbatu 2,r4 303 lwz r4,SL_DBAT2+4(r1) 304 mtdbatl 2,r4 305 lwz r4,SL_DBAT3(r1) 306 mtdbatu 3,r4 307 lwz r4,SL_DBAT3+4(r1) 308 mtdbatl 3,r4 309 lwz r4,SL_IBAT0(r1) 310 mtibatu 0,r4 311 lwz r4,SL_IBAT0+4(r1) 312 mtibatl 0,r4 313 lwz r4,SL_IBAT1(r1) 314 mtibatu 1,r4 315 lwz r4,SL_IBAT1+4(r1) 316 mtibatl 1,r4 317 lwz r4,SL_IBAT2(r1) 318 mtibatu 2,r4 319 lwz r4,SL_IBAT2+4(r1) 320 mtibatl 2,r4 321 lwz r4,SL_IBAT3(r1) 322 mtibatu 3,r4 323 lwz r4,SL_IBAT3+4(r1) 324 mtibatl 3,r4 325 326BEGIN_MMU_FTR_SECTION 327 li r4,0 328 mtspr SPRN_DBAT4U,r4 329 mtspr SPRN_DBAT4L,r4 330 mtspr SPRN_DBAT5U,r4 331 mtspr SPRN_DBAT5L,r4 332 mtspr SPRN_DBAT6U,r4 333 mtspr SPRN_DBAT6L,r4 334 mtspr SPRN_DBAT7U,r4 335 mtspr SPRN_DBAT7L,r4 336 mtspr SPRN_IBAT4U,r4 337 mtspr SPRN_IBAT4L,r4 338 mtspr SPRN_IBAT5U,r4 339 mtspr SPRN_IBAT5L,r4 340 mtspr SPRN_IBAT6U,r4 341 mtspr SPRN_IBAT6L,r4 342 mtspr SPRN_IBAT7U,r4 343 mtspr SPRN_IBAT7L,r4 344END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) 345 346 /* Flush all TLBs */ 347 lis r4,0x1000 3481: addic. r4,r4,-0x1000 349 tlbie r4 350 blt 1b 351 sync 352 353 /* restore the MSR and turn on the MMU */ 354 lwz r3,SL_MSR(r1) 355 bl turn_on_mmu 356 357 /* get back the stack pointer */ 358 tovirt(r1,r1) 359 360 /* Restore TB */ 361 li r3,0 362 mttbl r3 363 lwz r3,SL_TB(r1) 364 lwz r4,SL_TB+4(r1) 365 mttbu r3 366 mttbl r4 367 368 /* Restore the callee-saved registers and return */ 369 lwz r0,SL_CR(r1) 370 mtcr r0 371 lwz r2,SL_R2(r1) 372 lmw r12,SL_R12(r1) 373 addi r1,r1,SL_SIZE 374 lwz r0,4(r1) 375 mtlr r0 376 blr 377 378turn_on_mmu: 379 mflr r4 380 tovirt(r4,r4) 381 mtsrr0 r4 382 mtsrr1 r3 383 sync 384 isync 385 rfi 386 387#endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */ 388 389 .section .data 390 .balign L1_CACHE_BYTES 391sleep_storage: 392 .long 0 393 .balign L1_CACHE_BYTES, 0 394 395#endif /* CONFIG_6xx */ 396 .section .text 397