| Anton Vorontsov | 90103f9 | 2010-05-17 22:56:52 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Based on swsusp_32.S, modified for FSL BookE by |
| 3 | * Anton Vorontsov <avorontsov@ru.mvista.com> |
| 4 | * Copyright (c) 2009-2010 MontaVista Software, LLC. |
| 5 | */ |
| 6 | |
| 7 | #include <linux/threads.h> |
| 8 | #include <asm/processor.h> |
| 9 | #include <asm/page.h> |
| 10 | #include <asm/cputable.h> |
| 11 | #include <asm/thread_info.h> |
| 12 | #include <asm/ppc_asm.h> |
| 13 | #include <asm/asm-offsets.h> |
| 14 | #include <asm/mmu.h> |
| 15 | |
| 16 | /* |
| 17 | * Structure for storing CPU registers on the save area. |
| 18 | */ |
| 19 | #define SL_SP 0 |
| 20 | #define SL_PC 4 |
| 21 | #define SL_MSR 8 |
| 22 | #define SL_TCR 0xc |
| 23 | #define SL_SPRG0 0x10 |
| 24 | #define SL_SPRG1 0x14 |
| 25 | #define SL_SPRG2 0x18 |
| 26 | #define SL_SPRG3 0x1c |
| 27 | #define SL_SPRG4 0x20 |
| 28 | #define SL_SPRG5 0x24 |
| 29 | #define SL_SPRG6 0x28 |
| 30 | #define SL_SPRG7 0x2c |
| 31 | #define SL_TBU 0x30 |
| 32 | #define SL_TBL 0x34 |
| 33 | #define SL_R2 0x38 |
| 34 | #define SL_CR 0x3c |
| 35 | #define SL_LR 0x40 |
| 36 | #define SL_R12 0x44 /* r12 to r31 */ |
| 37 | #define SL_SIZE (SL_R12 + 80) |
| 38 | |
| 39 | .section .data |
| 40 | .align 5 |
| 41 | |
| 42 | _GLOBAL(swsusp_save_area) |
| 43 | .space SL_SIZE |
| 44 | |
| 45 | |
| 46 | .section .text |
| 47 | .align 5 |
| 48 | |
| 49 | _GLOBAL(swsusp_arch_suspend) |
| 50 | lis r11,swsusp_save_area@h |
| 51 | ori r11,r11,swsusp_save_area@l |
| 52 | |
| 53 | mflr r0 |
| 54 | stw r0,SL_LR(r11) |
| 55 | mfcr r0 |
| 56 | stw r0,SL_CR(r11) |
| 57 | stw r1,SL_SP(r11) |
| 58 | stw r2,SL_R2(r11) |
| 59 | stmw r12,SL_R12(r11) |
| 60 | |
| 61 | /* Save MSR & TCR */ |
| 62 | mfmsr r4 |
| 63 | stw r4,SL_MSR(r11) |
| 64 | mfspr r4,SPRN_TCR |
| 65 | stw r4,SL_TCR(r11) |
| 66 | |
| 67 | /* Get a stable timebase and save it */ |
| 68 | 1: mfspr r4,SPRN_TBRU |
| 69 | stw r4,SL_TBU(r11) |
| 70 | mfspr r5,SPRN_TBRL |
| 71 | stw r5,SL_TBL(r11) |
| 72 | mfspr r3,SPRN_TBRU |
| 73 | cmpw r3,r4 |
| 74 | bne 1b |
| 75 | |
| 76 | /* Save SPRGs */ |
| 77 | mfsprg r4,0 |
| 78 | stw r4,SL_SPRG0(r11) |
| 79 | mfsprg r4,1 |
| 80 | stw r4,SL_SPRG1(r11) |
| 81 | mfsprg r4,2 |
| 82 | stw r4,SL_SPRG2(r11) |
| 83 | mfsprg r4,3 |
| 84 | stw r4,SL_SPRG3(r11) |
| 85 | mfsprg r4,4 |
| 86 | stw r4,SL_SPRG4(r11) |
| 87 | mfsprg r4,5 |
| 88 | stw r4,SL_SPRG5(r11) |
| 89 | mfsprg r4,6 |
| 90 | stw r4,SL_SPRG6(r11) |
| 91 | mfsprg r4,7 |
| 92 | stw r4,SL_SPRG7(r11) |
| 93 | |
| 94 | /* Call the low level suspend stuff (we should probably have made |
| 95 | * a stackframe... |
| 96 | */ |
| 97 | bl swsusp_save |
| 98 | |
| 99 | /* Restore LR from the save area */ |
| 100 | lis r11,swsusp_save_area@h |
| 101 | ori r11,r11,swsusp_save_area@l |
| 102 | lwz r0,SL_LR(r11) |
| 103 | mtlr r0 |
| 104 | |
| 105 | blr |
| 106 | |
| 107 | _GLOBAL(swsusp_arch_resume) |
| 108 | sync |
| 109 | |
| 110 | /* Load ptr the list of pages to copy in r3 */ |
| 111 | lis r11,(restore_pblist)@h |
| 112 | ori r11,r11,restore_pblist@l |
| 113 | lwz r3,0(r11) |
| 114 | |
| 115 | /* Copy the pages. This is a very basic implementation, to |
| 116 | * be replaced by something more cache efficient */ |
| 117 | 1: |
| 118 | li r0,256 |
| 119 | mtctr r0 |
| 120 | lwz r5,pbe_address(r3) /* source */ |
| 121 | lwz r6,pbe_orig_address(r3) /* destination */ |
| 122 | 2: |
| 123 | lwz r8,0(r5) |
| 124 | lwz r9,4(r5) |
| 125 | lwz r10,8(r5) |
| 126 | lwz r11,12(r5) |
| 127 | addi r5,r5,16 |
| 128 | stw r8,0(r6) |
| 129 | stw r9,4(r6) |
| 130 | stw r10,8(r6) |
| 131 | stw r11,12(r6) |
| 132 | addi r6,r6,16 |
| 133 | bdnz 2b |
| 134 | lwz r3,pbe_next(r3) |
| 135 | cmpwi 0,r3,0 |
| 136 | bne 1b |
| 137 | |
| 138 | bl flush_dcache_L1 |
| 139 | bl flush_instruction_cache |
| 140 | |
| 141 | lis r11,swsusp_save_area@h |
| 142 | ori r11,r11,swsusp_save_area@l |
| 143 | |
| 144 | lwz r4,SL_SPRG0(r11) |
| 145 | mtsprg 0,r4 |
| 146 | lwz r4,SL_SPRG1(r11) |
| 147 | mtsprg 1,r4 |
| 148 | lwz r4,SL_SPRG2(r11) |
| 149 | mtsprg 2,r4 |
| 150 | lwz r4,SL_SPRG3(r11) |
| 151 | mtsprg 3,r4 |
| 152 | lwz r4,SL_SPRG4(r11) |
| 153 | mtsprg 4,r4 |
| 154 | lwz r4,SL_SPRG5(r11) |
| 155 | mtsprg 5,r4 |
| 156 | lwz r4,SL_SPRG6(r11) |
| 157 | mtsprg 6,r4 |
| 158 | lwz r4,SL_SPRG7(r11) |
| 159 | mtsprg 7,r4 |
| 160 | |
| 161 | /* restore the MSR */ |
| 162 | lwz r3,SL_MSR(r11) |
| 163 | mtmsr r3 |
| 164 | |
| 165 | /* Restore TB */ |
| 166 | li r3,0 |
| 167 | mtspr SPRN_TBWL,r3 |
| 168 | lwz r3,SL_TBU(r11) |
| 169 | lwz r4,SL_TBL(r11) |
| 170 | mtspr SPRN_TBWU,r3 |
| 171 | mtspr SPRN_TBWL,r4 |
| 172 | |
| 173 | /* Restore TCR and clear any pending bits in TSR. */ |
| 174 | lwz r4,SL_TCR(r11) |
| 175 | mtspr SPRN_TCR,r4 |
| 176 | lis r4, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h |
| 177 | mtspr SPRN_TSR,r4 |
| 178 | |
| 179 | /* Kick decrementer */ |
| 180 | li r0,1 |
| 181 | mtdec r0 |
| 182 | |
| 183 | /* Restore the callee-saved registers and return */ |
| 184 | lwz r0,SL_CR(r11) |
| 185 | mtcr r0 |
| 186 | lwz r2,SL_R2(r11) |
| 187 | lmw r12,SL_R12(r11) |
| 188 | lwz r1,SL_SP(r11) |
| 189 | lwz r0,SL_LR(r11) |
| 190 | mtlr r0 |
| 191 | |
| 192 | li r3,0 |
| 193 | blr |