| Benjamin Herrenschmidt | 948cf67 | 2011-01-24 18:42:41 +1100 | [diff] [blame] | 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) |
| Paul Mackerras | 2fde6d2 | 2011-12-05 19:47:26 +0000 | [diff] [blame] | 57 | stb r0,PACA_NAPSTATELOST(r13) |
| Benjamin Herrenschmidt | 948cf67 | 2011-01-24 18:42:41 +1100 | [diff] [blame] | 58 | |
| 59 | /* Continue saving state */ |
| 60 | SAVE_GPR(2, r1) |
| 61 | SAVE_NVGPRS(r1) |
| 62 | mfcr r3 |
| 63 | std r3,_CCR(r1) |
| 64 | std r9,_MSR(r1) |
| 65 | std r1,PACAR1(r13) |
| 66 | |
| 67 | /* Magic NAP mode enter sequence */ |
| 68 | std r0,0(r1) |
| 69 | ptesync |
| 70 | ld r0,0(r1) |
| 71 | 1: cmp cr0,r0,r0 |
| 72 | bne 1b |
| 73 | PPC_NAP |
| 74 | b . |
| 75 | |
| 76 | _GLOBAL(power7_wakeup_loss) |
| Benjamin Herrenschmidt | 948cf67 | 2011-01-24 18:42:41 +1100 | [diff] [blame] | 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) |
| Paul Mackerras | 2fde6d2 | 2011-12-05 19:47:26 +0000 | [diff] [blame] | 90 | lbz r0,PACA_NAPSTATELOST(r13) |
| 91 | cmpwi r0,0 |
| 92 | bne .power7_wakeup_loss |
| Benjamin Herrenschmidt | 948cf67 | 2011-01-24 18:42:41 +1100 | [diff] [blame] | 93 | ld r1,PACAR1(r13) |
| 94 | ld r4,_MSR(r1) |
| 95 | ld r5,_NIP(r1) |
| 96 | addi r1,r1,INT_FRAME_SIZE |
| 97 | mtspr SPRN_SRR1,r4 |
| 98 | mtspr SPRN_SRR0,r5 |
| 99 | rfid |