| /* |
| * This file contains the power_save function for 6xx & 7xxx CPUs |
| * rewritten in assembler |
| * |
| * Warning ! This code assumes that if your machine has a 750fx |
| * it will have PLL 1 set to low speed mode (used during NAP/DOZE). |
| * if this is not the case some additional changes will have to |
| * be done to check a runtime var (a bit like powersave-nap) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/config.h> |
| #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> |
| |
| #undef DEBUG |
| |
| .text |
| |
| /* |
| * Here is the power_save_6xx function. This could eventually be |
| * split into several functions & changing the function pointer |
| * depending on the various features. |
| */ |
| _GLOBAL(power4_idle) |
| BEGIN_FTR_SECTION |
| blr |
| END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP) |
| /* We must dynamically check for the NAP feature as it |
| * can be cleared by CPU init after the fixups are done |
| */ |
| LOADBASE(r3,cur_cpu_spec) |
| ld r4,cur_cpu_spec@l(r3) |
| ld r4,CPU_SPEC_FEATURES(r4) |
| andi. r0,r4,CPU_FTR_CAN_NAP |
| beqlr |
| /* Now check if user or arch enabled NAP mode */ |
| LOADBASE(r3,powersave_nap) |
| lwz r4,powersave_nap@l(r3) |
| cmpwi 0,r4,0 |
| beqlr |
| |
| /* Clear MSR:EE */ |
| mfmsr r7 |
| li r4,0 |
| ori r4,r4,MSR_EE |
| andc r0,r7,r4 |
| mtmsrd r0 |
| |
| /* Check current_thread_info()->flags */ |
| clrrdi r4,r1,THREAD_SHIFT |
| ld r4,TI_FLAGS(r4) |
| andi. r0,r4,_TIF_NEED_RESCHED |
| beq 1f |
| mtmsrd r7 /* out of line this ? */ |
| blr |
| 1: |
| /* Go to NAP now */ |
| BEGIN_FTR_SECTION |
| DSSALL |
| sync |
| END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) |
| oris r7,r7,MSR_POW@h |
| sync |
| isync |
| mtmsrd r7 |
| isync |
| sync |
| blr |
