projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * This file contains the power_save function for 6xx & 7xxx CPUs | |
| 3 | * rewritten in assembler | |
| 4 | * | |
| 5 | * Warning ! This code assumes that if your machine has a 750fx | |
| 6 | * it will have PLL 1 set to low speed mode (used during NAP/DOZE). | |
| 7 | * if this is not the case some additional changes will have to | |
| 8 | * be done to check a runtime var (a bit like powersave-nap) | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or | |
| 11 | * modify it under the terms of the GNU General Public License | |
| 12 | * as published by the Free Software Foundation; either version | |
| 13 | * 2 of the License, or (at your option) any later version. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/config.h> | |
| 17 | #include <linux/threads.h> | |
| 18 | #include <asm/processor.h> | |
| 19 | #include <asm/page.h> | |
| 20 | #include <asm/cputable.h> | |
| 21 | #include <asm/thread_info.h> | |
| 22 | #include <asm/ppc_asm.h> | |
| 0013a854 | 23 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
24 | |
| 25 | #undef DEBUG | |
| 26 | ||
| 27 | .text | |
| 28 | ||
| 29 | /* | |
| 30 | * Here is the power_save_6xx function. This could eventually be | |
| 31 | * split into several functions & changing the function pointer | |
| 32 | * depending on the various features. | |
| 33 | */ | |
| 34 | _GLOBAL(power4_idle) | |
| 35 | BEGIN_FTR_SECTION | |
| 36 | blr | |
| 37 | END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP) | |
| 38 | /* We must dynamically check for the NAP feature as it | |
| 39 | * can be cleared by CPU init after the fixups are done | |
| 40 | */ | |
| 41 | LOADBASE(r3,cur_cpu_spec) | |
| 61f684ec | 42 | ld r4,OFF(cur_cpu_spec)(r3) |
| 1da177e4 LT |
43 | ld r4,CPU_SPEC_FEATURES(r4) |
| 44 | andi. r0,r4,CPU_FTR_CAN_NAP | |
| 45 | beqlr | |
| 46 | /* Now check if user or arch enabled NAP mode */ | |
| 47 | LOADBASE(r3,powersave_nap) | |
| 61f684ec | 48 | lwz r4,OFF(powersave_nap)(r3) |
| 1da177e4 LT |
49 | cmpwi 0,r4,0 |
| 50 | beqlr | |
| 51 | ||
| 52 | /* Clear MSR:EE */ | |
| 53 | mfmsr r7 | |
| 54 | li r4,0 | |
| 55 | ori r4,r4,MSR_EE | |
| 56 | andc r0,r7,r4 | |
| 57 | mtmsrd r0 | |
| 58 | ||
| 59 | /* Check current_thread_info()->flags */ | |
| 60 | clrrdi r4,r1,THREAD_SHIFT | |
| 61 | ld r4,TI_FLAGS(r4) | |
| 62 | andi. r0,r4,_TIF_NEED_RESCHED | |
| 63 | beq 1f | |
| 64 | mtmsrd r7 /* out of line this ? */ | |
| 65 | blr | |
| dc1c1ca3 SR |
66 | 1: |
| 67 | /* Go to NAP now */ | |
| 1da177e4 LT |
68 | BEGIN_FTR_SECTION |
| 69 | DSSALL | |
| 70 | sync | |
| 71 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
| 72 | oris r7,r7,MSR_POW@h | |
| 73 | sync | |
| 74 | isync | |
| 75 | mtmsrd r7 | |
| 76 | isync | |
| 77 | sync | |
| 78 | blr |