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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/sysdev/6xx-suspend.S
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/*

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 * Enter and leave sleep state on chips with 6xx-style HID0

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 * power management bits, which don't leave sleep state via reset.

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 *

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 * Author: Scott Wood <[email protected]>

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 *

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 * Copyright (c) 2006-2007 Freescale Semiconductor, Inc.

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 *

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 * This program is free software; you can redistribute it and/or modify it

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 * under the terms of the GNU General Public License version 2 as published

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 * by the Free Software Foundation.

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 */

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#include <asm/ppc_asm.h>

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#include <asm/reg.h>

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#include <asm/thread_info.h>

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#include <asm/asm-offsets.h>

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_GLOBAL(mpc6xx_enter_standby)

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	mflr	r4

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	mfspr	r5, SPRN_HID0

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	rlwinm	r5, r5, 0, ~(HID0_DOZE | HID0_NAP)

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	oris	r5, r5, HID0_SLEEP@h

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	mtspr	SPRN_HID0, r5

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	isync

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	lis	r5, ret_from_standby@h

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	ori	r5, r5, ret_from_standby@l

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	mtlr	r5

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	rlwinm	r5, r1, 0, 0, 31-THREAD_SHIFT

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	lwz	r6, TI_LOCAL_FLAGS(r5)

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	ori	r6, r6, _TLF_SLEEPING

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	stw	r6, TI_LOCAL_FLAGS(r5)

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	mfmsr	r5

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	ori	r5, r5, MSR_EE

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	oris	r5, r5, MSR_POW@h

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	sync

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	mtmsr	r5

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	isync

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1:	b	1b

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ret_from_standby:

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	mfspr	r5, SPRN_HID0

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	rlwinm	r5, r5, 0, ~HID0_SLEEP

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	mtspr	SPRN_HID0, r5

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	mtlr	r4

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	blr

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