projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 948cf67c BH |
1 | /* |
| 2 | * This file contains the power_save function for 970-family CPUs. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or | |
| 5 | * modify it under the terms of the GNU General Public License | |
| 6 | * as published by the Free Software Foundation; either version | |
| 7 | * 2 of the License, or (at your option) any later version. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/threads.h> | |
| 11 | #include <asm/processor.h> | |
| 12 | #include <asm/page.h> | |
| 13 | #include <asm/cputable.h> | |
| 14 | #include <asm/thread_info.h> | |
| 15 | #include <asm/ppc_asm.h> | |
| 16 | #include <asm/asm-offsets.h> | |
| 17 | #include <asm/ppc-opcode.h> | |
| 18 | ||
| 19 | #undef DEBUG | |
| 20 | ||
| 21 | .text | |
| 22 | ||
| 23 | _GLOBAL(power7_idle) | |
| 24 | /* Now check if user or arch enabled NAP mode */ | |
| 25 | LOAD_REG_ADDRBASE(r3,powersave_nap) | |
| 26 | lwz r4,ADDROFF(powersave_nap)(r3) | |
| 27 | cmpwi 0,r4,0 | |
| 28 | beqlr | |
| 29 | ||
| 30 | /* NAP is a state loss, we create a regs frame on the | |
| 31 | * stack, fill it up with the state we care about and | |
| 32 | * stick a pointer to it in PACAR1. We really only | |
| 33 | * need to save PC, some CR bits and the NV GPRs, | |
| 34 | * but for now an interrupt frame will do. | |
| 35 | */ | |
| 36 | mflr r0 | |
| 37 | std r0,16(r1) | |
| 38 | stdu r1,-INT_FRAME_SIZE(r1) | |
| 39 | std r0,_LINK(r1) | |
| 40 | std r0,_NIP(r1) | |
| 41 | ||
| 42 | #ifndef CONFIG_SMP | |
| 43 | /* Make sure FPU, VSX etc... are flushed as we may lose | |
| 44 | * state when going to nap mode | |
| 45 | */ | |
| 46 | bl .discard_lazy_cpu_state | |
| 47 | #endif /* CONFIG_SMP */ | |
| 48 | ||
| 49 | /* Hard disable interrupts */ | |
| 50 | mfmsr r9 | |
| 51 | rldicl r9,r9,48,1 | |
| 52 | rotldi r9,r9,16 | |
| 53 | mtmsrd r9,1 /* hard-disable interrupts */ | |
| 54 | li r0,0 | |
| 55 | stb r0,PACASOFTIRQEN(r13) /* we'll hard-enable shortly */ | |
| 56 | stb r0,PACAHARDIRQEN(r13) | |
| 57 | ||
| 58 | /* Continue saving state */ | |
| 59 | SAVE_GPR(2, r1) | |
| 60 | SAVE_NVGPRS(r1) | |
| 61 | mfcr r3 | |
| 62 | std r3,_CCR(r1) | |
| 63 | std r9,_MSR(r1) | |
| 64 | std r1,PACAR1(r13) | |
| 65 | ||
| 66 | /* Magic NAP mode enter sequence */ | |
| 67 | std r0,0(r1) | |
| 68 | ptesync | |
| 69 | ld r0,0(r1) | |
| 70 | 1: cmp cr0,r0,r0 | |
| 71 | bne 1b | |
| 72 | PPC_NAP | |
| 73 | b . | |
| 74 | ||
| 75 | _GLOBAL(power7_wakeup_loss) | |
| 76 | GET_PACA(r13) | |
| 77 | ld r1,PACAR1(r13) | |
| 78 | REST_NVGPRS(r1) | |
| 79 | REST_GPR(2, r1) | |
| 80 | ld r3,_CCR(r1) | |
| 81 | ld r4,_MSR(r1) | |
| 82 | ld r5,_NIP(r1) | |
| 83 | addi r1,r1,INT_FRAME_SIZE | |
| 84 | mtcr r3 | |
| 85 | mtspr SPRN_SRR1,r4 | |
| 86 | mtspr SPRN_SRR0,r5 | |
| 87 | rfid | |
| 88 | ||
| 89 | _GLOBAL(power7_wakeup_noloss) | |
| 90 | GET_PACA(r13) | |
| 91 | ld r1,PACAR1(r13) | |
| 92 | ld r4,_MSR(r1) | |
| 93 | ld r5,_NIP(r1) | |
| 94 | addi r1,r1,INT_FRAME_SIZE | |
| 95 | mtspr SPRN_SRR1,r4 | |
| 96 | mtspr SPRN_SRR0,r5 | |
| 97 | rfid |