| /* |
| * This file contains sleep low-level functions for PowerBook G3. |
| * Copyright (C) 1999 Benjamin Herrenschmidt (benh@kernel.crashing.org) |
| * and Paul Mackerras (paulus@samba.org). |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| */ |
| |
| #include <linux/config.h> |
| #include <asm/processor.h> |
| #include <asm/page.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/cputable.h> |
| #include <asm/cache.h> |
| #include <asm/thread_info.h> |
| #include <asm/offsets.h> |
| |
| #define MAGIC 0x4c617273 /* 'Lars' */ |
| |
| /* |
| * Structure for storing CPU registers on the stack. |
| */ |
| #define SL_SP 0 |
| #define SL_PC 4 |
| #define SL_MSR 8 |
| #define SL_SDR1 0xc |
| #define SL_SPRG0 0x10 /* 4 sprg's */ |
| #define SL_DBAT0 0x20 |
| #define SL_IBAT0 0x28 |
| #define SL_DBAT1 0x30 |
| #define SL_IBAT1 0x38 |
| #define SL_DBAT2 0x40 |
| #define SL_IBAT2 0x48 |
| #define SL_DBAT3 0x50 |
| #define SL_IBAT3 0x58 |
| #define SL_TB 0x60 |
| #define SL_R2 0x68 |
| #define SL_CR 0x6c |
| #define SL_R12 0x70 /* r12 to r31 */ |
| #define SL_SIZE (SL_R12 + 80) |
| |
| .section .text |
| .align 5 |
| |
| #if defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ_PMAC) |
| |
| /* This gets called by via-pmu.c late during the sleep process. |
| * The PMU was already send the sleep command and will shut us down |
| * soon. We need to save all that is needed and setup the wakeup |
| * vector that will be called by the ROM on wakeup |
| */ |
| _GLOBAL(low_sleep_handler) |
| #ifndef CONFIG_6xx |
| blr |
| #else |
| mflr r0 |
| stw r0,4(r1) |
| stwu r1,-SL_SIZE(r1) |
| mfcr r0 |
| stw r0,SL_CR(r1) |
| stw r2,SL_R2(r1) |
| stmw r12,SL_R12(r1) |
| |
| /* Save MSR & SDR1 */ |
| mfmsr r4 |
| stw r4,SL_MSR(r1) |
| mfsdr1 r4 |
| stw r4,SL_SDR1(r1) |
| |
| /* Get a stable timebase and save it */ |
| 1: mftbu r4 |
| stw r4,SL_TB(r1) |
| mftb r5 |
| stw r5,SL_TB+4(r1) |
| mftbu r3 |
| cmpw r3,r4 |
| bne 1b |
| |
| /* Save SPRGs */ |
| mfsprg r4,0 |
| stw r4,SL_SPRG0(r1) |
| mfsprg r4,1 |
| stw r4,SL_SPRG0+4(r1) |
| mfsprg r4,2 |
| stw r4,SL_SPRG0+8(r1) |
| mfsprg r4,3 |
| stw r4,SL_SPRG0+12(r1) |
| |
| /* Save BATs */ |
| mfdbatu r4,0 |
| stw r4,SL_DBAT0(r1) |
| mfdbatl r4,0 |
| stw r4,SL_DBAT0+4(r1) |
| mfdbatu r4,1 |
| stw r4,SL_DBAT1(r1) |
| mfdbatl r4,1 |
| stw r4,SL_DBAT1+4(r1) |
| mfdbatu r4,2 |
| stw r4,SL_DBAT2(r1) |
| mfdbatl r4,2 |
| stw r4,SL_DBAT2+4(r1) |
| mfdbatu r4,3 |
| stw r4,SL_DBAT3(r1) |
| mfdbatl r4,3 |
| stw r4,SL_DBAT3+4(r1) |
| mfibatu r4,0 |
| stw r4,SL_IBAT0(r1) |
| mfibatl r4,0 |
| stw r4,SL_IBAT0+4(r1) |
| mfibatu r4,1 |
| stw r4,SL_IBAT1(r1) |
| mfibatl r4,1 |
| stw r4,SL_IBAT1+4(r1) |
| mfibatu r4,2 |
| stw r4,SL_IBAT2(r1) |
| mfibatl r4,2 |
| stw r4,SL_IBAT2+4(r1) |
| mfibatu r4,3 |
| stw r4,SL_IBAT3(r1) |
| mfibatl r4,3 |
| stw r4,SL_IBAT3+4(r1) |
| |
| /* Backup various CPU config stuffs */ |
| bl __save_cpu_setup |
| |
| /* The ROM can wake us up via 2 different vectors: |
| * - On wallstreet & lombard, we must write a magic |
| * value 'Lars' at address 4 and a pointer to a |
| * memory location containing the PC to resume from |
| * at address 0. |
| * - On Core99, we must store the wakeup vector at |
| * address 0x80 and eventually it's parameters |
| * at address 0x84. I've have some trouble with those |
| * parameters however and I no longer use them. |
| */ |
| lis r5,grackle_wake_up@ha |
| addi r5,r5,grackle_wake_up@l |
| tophys(r5,r5) |
| stw r5,SL_PC(r1) |
| lis r4,KERNELBASE@h |
| tophys(r5,r1) |
| addi r5,r5,SL_PC |
| lis r6,MAGIC@ha |
| addi r6,r6,MAGIC@l |
| stw r5,0(r4) |
| stw r6,4(r4) |
| /* Setup stuffs at 0x80-0x84 for Core99 */ |
| lis r3,core99_wake_up@ha |
| addi r3,r3,core99_wake_up@l |
| tophys(r3,r3) |
| stw r3,0x80(r4) |
| stw r5,0x84(r4) |
| /* Store a pointer to our backup storage into |
| * a kernel global |
| */ |
| lis r3,sleep_storage@ha |
| addi r3,r3,sleep_storage@l |
| stw r5,0(r3) |
| |
| /* Flush & disable all caches */ |
| bl flush_disable_caches |
| |
| /* Turn off data relocation. */ |
| mfmsr r3 /* Save MSR in r7 */ |
| rlwinm r3,r3,0,28,26 /* Turn off DR bit */ |
| sync |
| mtmsr r3 |
| isync |
| |
| BEGIN_FTR_SECTION |
| /* Flush any pending L2 data prefetches to work around HW bug */ |
| sync |
| lis r3,0xfff0 |
| lwz r0,0(r3) /* perform cache-inhibited load to ROM */ |
| sync /* (caches are disabled at this point) */ |
| END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450) |
| |
| /* |
| * Set the HID0 and MSR for sleep. |
| */ |
| mfspr r2,SPRN_HID0 |
| rlwinm r2,r2,0,10,7 /* clear doze, nap */ |
| oris r2,r2,HID0_SLEEP@h |
| sync |
| isync |
| mtspr SPRN_HID0,r2 |
| sync |
| |
| /* This loop puts us back to sleep in case we have a spurrious |
| * wakeup so that the host bridge properly stays asleep. The |
| * CPU will be turned off, either after a known time (about 1 |
| * second) on wallstreet & lombard, or as soon as the CPU enters |
| * SLEEP mode on core99 |
| */ |
| mfmsr r2 |
| oris r2,r2,MSR_POW@h |
| 1: sync |
| mtmsr r2 |
| isync |
| b 1b |
| |
| /* |
| * Here is the resume code. |
| */ |
| |
| |
| /* |
| * Core99 machines resume here |
| * r4 has the physical address of SL_PC(sp) (unused) |
| */ |
| _GLOBAL(core99_wake_up) |
| /* Make sure HID0 no longer contains any sleep bit and that data cache |
| * is disabled |
| */ |
| mfspr r3,SPRN_HID0 |
| rlwinm r3,r3,0,11,7 /* clear SLEEP, NAP, DOZE bits */ |
| rlwinm 3,r3,0,18,15 /* clear DCE, ICE */ |
| mtspr SPRN_HID0,r3 |
| sync |
| isync |
| |
| /* sanitize MSR */ |
| mfmsr r3 |
| ori r3,r3,MSR_EE|MSR_IP |
| xori r3,r3,MSR_EE|MSR_IP |
| sync |
| isync |
| mtmsr r3 |
| sync |
| isync |
| |
| /* Recover sleep storage */ |
| lis r3,sleep_storage@ha |
| addi r3,r3,sleep_storage@l |
| tophys(r3,r3) |
| lwz r1,0(r3) |
| |
| /* Pass thru to older resume code ... */ |
| /* |
| * Here is the resume code for older machines. |
| * r1 has the physical address of SL_PC(sp). |
| */ |
| |
| grackle_wake_up: |
| |
| /* Restore the kernel's segment registers before |
| * we do any r1 memory access as we are not sure they |
| * are in a sane state above the first 256Mb region |
| */ |
| li r0,16 /* load up segment register values */ |
| mtctr r0 /* for context 0 */ |
| lis r3,0x2000 /* Ku = 1, VSID = 0 */ |
| li r4,0 |
| 3: mtsrin r3,r4 |
| addi r3,r3,0x111 /* increment VSID */ |
| addis r4,r4,0x1000 /* address of next segment */ |
| bdnz 3b |
| sync |
| isync |
| |
| subi r1,r1,SL_PC |
| |
| /* Restore various CPU config stuffs */ |
| bl __restore_cpu_setup |
| |
| /* Make sure all FPRs have been initialized */ |
| bl reloc_offset |
| bl __init_fpu_registers |
| |
| /* Invalidate & enable L1 cache, we don't care about |
| * whatever the ROM may have tried to write to memory |
| */ |
| bl __inval_enable_L1 |
| |
| /* Restore the BATs, and SDR1. Then we can turn on the MMU. */ |
| lwz r4,SL_SDR1(r1) |
| mtsdr1 r4 |
| lwz r4,SL_SPRG0(r1) |
| mtsprg 0,r4 |
| lwz r4,SL_SPRG0+4(r1) |
| mtsprg 1,r4 |
| lwz r4,SL_SPRG0+8(r1) |
| mtsprg 2,r4 |
| lwz r4,SL_SPRG0+12(r1) |
| mtsprg 3,r4 |
| |
| lwz r4,SL_DBAT0(r1) |
| mtdbatu 0,r4 |
| lwz r4,SL_DBAT0+4(r1) |
| mtdbatl 0,r4 |
| lwz r4,SL_DBAT1(r1) |
| mtdbatu 1,r4 |
| lwz r4,SL_DBAT1+4(r1) |
| mtdbatl 1,r4 |
| lwz r4,SL_DBAT2(r1) |
| mtdbatu 2,r4 |
| lwz r4,SL_DBAT2+4(r1) |
| mtdbatl 2,r4 |
| lwz r4,SL_DBAT3(r1) |
| mtdbatu 3,r4 |
| lwz r4,SL_DBAT3+4(r1) |
| mtdbatl 3,r4 |
| lwz r4,SL_IBAT0(r1) |
| mtibatu 0,r4 |
| lwz r4,SL_IBAT0+4(r1) |
| mtibatl 0,r4 |
| lwz r4,SL_IBAT1(r1) |
| mtibatu 1,r4 |
| lwz r4,SL_IBAT1+4(r1) |
| mtibatl 1,r4 |
| lwz r4,SL_IBAT2(r1) |
| mtibatu 2,r4 |
| lwz r4,SL_IBAT2+4(r1) |
| mtibatl 2,r4 |
| lwz r4,SL_IBAT3(r1) |
| mtibatu 3,r4 |
| lwz r4,SL_IBAT3+4(r1) |
| mtibatl 3,r4 |
| |
| BEGIN_FTR_SECTION |
| li r4,0 |
| mtspr SPRN_DBAT4U,r4 |
| mtspr SPRN_DBAT4L,r4 |
| mtspr SPRN_DBAT5U,r4 |
| mtspr SPRN_DBAT5L,r4 |
| mtspr SPRN_DBAT6U,r4 |
| mtspr SPRN_DBAT6L,r4 |
| mtspr SPRN_DBAT7U,r4 |
| mtspr SPRN_DBAT7L,r4 |
| mtspr SPRN_IBAT4U,r4 |
| mtspr SPRN_IBAT4L,r4 |
| mtspr SPRN_IBAT5U,r4 |
| mtspr SPRN_IBAT5L,r4 |
| mtspr SPRN_IBAT6U,r4 |
| mtspr SPRN_IBAT6L,r4 |
| mtspr SPRN_IBAT7U,r4 |
| mtspr SPRN_IBAT7L,r4 |
| END_FTR_SECTION_IFSET(CPU_FTR_HAS_HIGH_BATS) |
| |
| /* Flush all TLBs */ |
| lis r4,0x1000 |
| 1: addic. r4,r4,-0x1000 |
| tlbie r4 |
| blt 1b |
| sync |
| |
| /* restore the MSR and turn on the MMU */ |
| lwz r3,SL_MSR(r1) |
| bl turn_on_mmu |
| |
| /* get back the stack pointer */ |
| tovirt(r1,r1) |
| |
| /* Restore TB */ |
| li r3,0 |
| mttbl r3 |
| lwz r3,SL_TB(r1) |
| lwz r4,SL_TB+4(r1) |
| mttbu r3 |
| mttbl r4 |
| |
| /* Restore the callee-saved registers and return */ |
| lwz r0,SL_CR(r1) |
| mtcr r0 |
| lwz r2,SL_R2(r1) |
| lmw r12,SL_R12(r1) |
| addi r1,r1,SL_SIZE |
| lwz r0,4(r1) |
| mtlr r0 |
| blr |
| |
| turn_on_mmu: |
| mflr r4 |
| tovirt(r4,r4) |
| mtsrr0 r4 |
| mtsrr1 r3 |
| sync |
| isync |
| rfi |
| |
| #endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */ |
| |
| .section .data |
| .balign L1_CACHE_LINE_SIZE |
| sleep_storage: |
| .long 0 |
| .balign L1_CACHE_LINE_SIZE, 0 |
| |
| #endif /* CONFIG_6xx */ |
| .section .text |
