| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Based on swsusp_32.S, modified for FSL BookE by |
| * Anton Vorontsov <avorontsov@ru.mvista.com> |
| * Copyright (c) 2009-2010 MontaVista Software, LLC. |
| */ |
| |
| #include <linux/threads.h> |
| #include <asm/processor.h> |
| #include <asm/page.h> |
| #include <asm/cputable.h> |
| #include <asm/thread_info.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/mmu.h> |
| |
| /* |
| * Structure for storing CPU registers on the save area. |
| */ |
| #define SL_SP 0 |
| #define SL_PC 4 |
| #define SL_MSR 8 |
| #define SL_TCR 0xc |
| #define SL_SPRG0 0x10 |
| #define SL_SPRG1 0x14 |
| #define SL_SPRG2 0x18 |
| #define SL_SPRG3 0x1c |
| #define SL_SPRG4 0x20 |
| #define SL_SPRG5 0x24 |
| #define SL_SPRG6 0x28 |
| #define SL_SPRG7 0x2c |
| #define SL_TBU 0x30 |
| #define SL_TBL 0x34 |
| #define SL_R2 0x38 |
| #define SL_CR 0x3c |
| #define SL_LR 0x40 |
| #define SL_R12 0x44 /* r12 to r31 */ |
| #define SL_SIZE (SL_R12 + 80) |
| |
| .section .data |
| .align 5 |
| |
| _GLOBAL(swsusp_save_area) |
| .space SL_SIZE |
| |
| |
| .section .text |
| .align 5 |
| |
| _GLOBAL(swsusp_arch_suspend) |
| lis r11,swsusp_save_area@h |
| ori r11,r11,swsusp_save_area@l |
| |
| mflr r0 |
| stw r0,SL_LR(r11) |
| mfcr r0 |
| stw r0,SL_CR(r11) |
| stw r1,SL_SP(r11) |
| stw r2,SL_R2(r11) |
| stmw r12,SL_R12(r11) |
| |
| /* Save MSR & TCR */ |
| mfmsr r4 |
| stw r4,SL_MSR(r11) |
| mfspr r4,SPRN_TCR |
| stw r4,SL_TCR(r11) |
| |
| /* Get a stable timebase and save it */ |
| 1: mfspr r4,SPRN_TBRU |
| stw r4,SL_TBU(r11) |
| mfspr r5,SPRN_TBRL |
| stw r5,SL_TBL(r11) |
| mfspr r3,SPRN_TBRU |
| cmpw r3,r4 |
| bne 1b |
| |
| /* Save SPRGs */ |
| mfspr r4,SPRN_SPRG0 |
| stw r4,SL_SPRG0(r11) |
| mfspr r4,SPRN_SPRG1 |
| stw r4,SL_SPRG1(r11) |
| mfspr r4,SPRN_SPRG2 |
| stw r4,SL_SPRG2(r11) |
| mfspr r4,SPRN_SPRG3 |
| stw r4,SL_SPRG3(r11) |
| mfspr r4,SPRN_SPRG4 |
| stw r4,SL_SPRG4(r11) |
| mfspr r4,SPRN_SPRG5 |
| stw r4,SL_SPRG5(r11) |
| mfspr r4,SPRN_SPRG6 |
| stw r4,SL_SPRG6(r11) |
| mfspr r4,SPRN_SPRG7 |
| stw r4,SL_SPRG7(r11) |
| |
| /* Call the low level suspend stuff (we should probably have made |
| * a stackframe... |
| */ |
| bl swsusp_save |
| |
| /* Restore LR from the save area */ |
| lis r11,swsusp_save_area@h |
| ori r11,r11,swsusp_save_area@l |
| lwz r0,SL_LR(r11) |
| mtlr r0 |
| |
| blr |
| |
| _GLOBAL(swsusp_arch_resume) |
| sync |
| |
| /* Load ptr the list of pages to copy in r3 */ |
| lis r11,(restore_pblist)@h |
| ori r11,r11,restore_pblist@l |
| lwz r3,0(r11) |
| |
| /* Copy the pages. This is a very basic implementation, to |
| * be replaced by something more cache efficient */ |
| 1: |
| li r0,256 |
| mtctr r0 |
| lwz r5,pbe_address(r3) /* source */ |
| lwz r6,pbe_orig_address(r3) /* destination */ |
| 2: |
| lwz r8,0(r5) |
| lwz r9,4(r5) |
| lwz r10,8(r5) |
| lwz r11,12(r5) |
| addi r5,r5,16 |
| stw r8,0(r6) |
| stw r9,4(r6) |
| stw r10,8(r6) |
| stw r11,12(r6) |
| addi r6,r6,16 |
| bdnz 2b |
| lwz r3,pbe_next(r3) |
| cmpwi 0,r3,0 |
| bne 1b |
| |
| bl flush_dcache_L1 |
| bl flush_instruction_cache |
| |
| lis r11,swsusp_save_area@h |
| ori r11,r11,swsusp_save_area@l |
| |
| /* |
| * Mappings from virtual addresses to physical addresses may be |
| * different than they were prior to restoring hibernation state. |
| * Invalidate the TLB so that the boot CPU is using the new |
| * mappings. |
| */ |
| bl _tlbil_all |
| |
| lwz r4,SL_SPRG0(r11) |
| mtspr SPRN_SPRG0,r4 |
| lwz r4,SL_SPRG1(r11) |
| mtspr SPRN_SPRG1,r4 |
| lwz r4,SL_SPRG2(r11) |
| mtspr SPRN_SPRG2,r4 |
| lwz r4,SL_SPRG3(r11) |
| mtspr SPRN_SPRG3,r4 |
| lwz r4,SL_SPRG4(r11) |
| mtspr SPRN_SPRG4,r4 |
| lwz r4,SL_SPRG5(r11) |
| mtspr SPRN_SPRG5,r4 |
| lwz r4,SL_SPRG6(r11) |
| mtspr SPRN_SPRG6,r4 |
| lwz r4,SL_SPRG7(r11) |
| mtspr SPRN_SPRG7,r4 |
| |
| /* restore the MSR */ |
| lwz r3,SL_MSR(r11) |
| mtmsr r3 |
| |
| /* Restore TB */ |
| li r3,0 |
| mtspr SPRN_TBWL,r3 |
| lwz r3,SL_TBU(r11) |
| lwz r4,SL_TBL(r11) |
| mtspr SPRN_TBWU,r3 |
| mtspr SPRN_TBWL,r4 |
| |
| /* Restore TCR and clear any pending bits in TSR. */ |
| lwz r4,SL_TCR(r11) |
| mtspr SPRN_TCR,r4 |
| lis r4, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h |
| mtspr SPRN_TSR,r4 |
| |
| /* Kick decrementer */ |
| li r0,1 |
| mtdec r0 |
| |
| /* Restore the callee-saved registers and return */ |
| lwz r0,SL_CR(r11) |
| mtcr r0 |
| lwz r2,SL_R2(r11) |
| lmw r12,SL_R12(r11) |
| lwz r1,SL_SP(r11) |
| lwz r0,SL_LR(r11) |
| mtlr r0 |
| |
| li r3,0 |
| blr |
