6xx-suspend.S
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/*
* Enter and leave sleep state on chips with 6xx-style HID0
* power management bits, which don't leave sleep state via reset.
*
* Author: Scott Wood <scottwood@freescale.com>
*
* Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <asm/ppc_asm.h>
#include <asm/reg.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
_GLOBAL(mpc6xx_enter_standby)
mflr r4
mfspr r5, SPRN_HID0
rlwinm r5, r5, 0, ~(HID0_DOZE | HID0_NAP)
oris r5, r5, HID0_SLEEP@h
mtspr SPRN_HID0, r5
isync
lis r5, ret_from_standby@h
ori r5, r5, ret_from_standby@l
mtlr r5
rlwinm r5, r1, 0, 0, 31-THREAD_SHIFT
lwz r6, TI_LOCAL_FLAGS(r5)
ori r6, r6, _TLF_SLEEPING
stw r6, TI_LOCAL_FLAGS(r5)
mfmsr r5
ori r5, r5, MSR_EE
oris r5, r5, MSR_POW@h
sync
mtmsr r5
isync
1: b 1b
ret_from_standby:
mfspr r5, SPRN_HID0
rlwinm r5, r5, 0, ~HID0_SLEEP
mtspr SPRN_HID0, r5
mtlr r4
blr