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/*
* 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
/*
* Init idle, called at early CPU setup time from head.S for each CPU
* So nothing for now. Called with r24 containing CPU number and r3
* reloc offset
*/
.globl init_idle_power4
init_idle_power4:
blr
/*
* Here is the power_save_6xx function. This could eventually be
* split into several functions & changing the function pointer
* depending on the various features.
*/
.globl power4_idle
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
*/
lis r4,cur_cpu_spec@ha
lwz r4,cur_cpu_spec@l(r4)
lwz r4,CPU_SPEC_FEATURES(r4)
andi. r0,r4,CPU_FTR_CAN_NAP
beqlr
/* Now check if user or arch enabled NAP mode */
lis r4,powersave_nap@ha
lwz r4,powersave_nap@l(r4)
cmpwi 0,r4,0
beqlr
/* Clear MSR:EE */
mfmsr r7
rlwinm r0,r7,0,17,15
mtmsr r0
/* Check current_thread_info()->flags */
rlwinm r4,r1,0,0,18
lwz r4,TI_FLAGS(r4)
andi. r0,r4,_TIF_NEED_RESCHED
beq 1f
mtmsr r7 /* out of line this ? */
blr
1:
/* Go to NAP now */
BEGIN_FTR_SECTION
DSSALL
sync
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
ori r7,r7,MSR_EE /* Could be ommited (already set) */
oris r7,r7,MSR_POW@h
sync
isync
mtmsr r7
isync
sync
blr
.globl powersave_nap
powersave_nap:
.long 0
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