fc4033b2f8
The e500 core enter DOZE/NAP power-saving modes when the core go to cpu_idle routine. The power management default running mode is DOZE, If the user echo 1 > /proc/sys/kernel/powersave-nap the system will change to NAP running mode. Signed-off-by: Dave Liu <daveliu@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
85 lines
2.0 KiB
ArmAsm
85 lines
2.0 KiB
ArmAsm
/*
|
|
* Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
|
|
* Dave Liu <daveliu@freescale.com>
|
|
* copy from idle_6xx.S and modify for e500 based processor,
|
|
* implement the power_save function in idle.
|
|
*
|
|
* 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/threads.h>
|
|
#include <asm/reg.h>
|
|
#include <asm/page.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/ppc_asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
.text
|
|
|
|
_GLOBAL(e500_idle)
|
|
rlwinm r3,r1,0,0,31-THREAD_SHIFT /* current thread_info */
|
|
lwz r4,TI_LOCAL_FLAGS(r3) /* set napping bit */
|
|
ori r4,r4,_TLF_NAPPING /* so when we take an exception */
|
|
stw r4,TI_LOCAL_FLAGS(r3) /* it will return to our caller */
|
|
|
|
/* Check if we can nap or doze, put HID0 mask in r3 */
|
|
lis r3,0
|
|
BEGIN_FTR_SECTION
|
|
lis r3,HID0_DOZE@h
|
|
END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE)
|
|
|
|
BEGIN_FTR_SECTION
|
|
/* Now check if user enabled NAP mode */
|
|
lis r4,powersave_nap@ha
|
|
lwz r4,powersave_nap@l(r4)
|
|
cmpwi 0,r4,0
|
|
beq 1f
|
|
stwu r1,-16(r1)
|
|
mflr r0
|
|
stw r0,20(r1)
|
|
bl flush_dcache_L1
|
|
lwz r0,20(r1)
|
|
addi r1,r1,16
|
|
mtlr r0
|
|
lis r3,HID0_NAP@h
|
|
END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
|
|
1:
|
|
/* Go to NAP or DOZE now */
|
|
mfspr r4,SPRN_HID0
|
|
rlwinm r4,r4,0,~(HID0_DOZE|HID0_NAP|HID0_SLEEP)
|
|
or r4,r4,r3
|
|
isync
|
|
mtspr SPRN_HID0,r4
|
|
isync
|
|
|
|
mfmsr r7
|
|
oris r7,r7,MSR_WE@h
|
|
ori r7,r7,MSR_EE
|
|
msync
|
|
mtmsr r7
|
|
isync
|
|
2: b 2b
|
|
|
|
/*
|
|
* Return from NAP/DOZE mode, restore some CPU specific registers,
|
|
* r2 containing physical address of current.
|
|
* r11 points to the exception frame (physical address).
|
|
* We have to preserve r10.
|
|
*/
|
|
_GLOBAL(power_save_ppc32_restore)
|
|
lwz r9,_LINK(r11) /* interrupted in e500_idle */
|
|
stw r9,_NIP(r11) /* make it do a blr */
|
|
|
|
#ifdef CONFIG_SMP
|
|
mfspr r12,SPRN_SPRG3
|
|
lwz r11,TI_CPU(r12) /* get cpu number * 4 */
|
|
slwi r11,r11,2
|
|
#else
|
|
li r11,0
|
|
#endif
|
|
b transfer_to_handler_cont
|