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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/platforms/pasemi/powersave.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * Copyright (C) 2006-2007 PA Semi, Inc

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 *

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 * Maintained by: Olof Johansson <[email protected]>

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 */

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#include <asm/processor.h>

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#include <asm/page.h>

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#include <asm/ppc_asm.h>

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#include <asm/cputable.h>

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#include <asm/cache.h>

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#include <asm/thread_info.h>

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#include <asm/asm-offsets.h>

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/* Power savings opcodes since not all binutils have them at this time */

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#define DOZE	.long	0x4c000324

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#define NAP	.long	0x4c000364

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#define SLEEP	.long	0x4c0003a4

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#define RVW	.long	0x4c0003e4

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/* Common sequence to do before going to any of the

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 * powersavings modes.

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 */

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#define PRE_SLEEP_SEQUENCE	\

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	std	r3,8(r1);	\

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	ptesync	;		\

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	ld	r3,8(r1);	\

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1:	cmpd 	r3,r3;		\

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	bne	1b

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_doze:

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	PRE_SLEEP_SEQUENCE

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	DOZE

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	b	.

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_GLOBAL(idle_spin)

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	blr

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_GLOBAL(idle_doze)

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	LOAD_REG_ADDR(r3, _doze)

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	b	sleep_common

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/* Add more modes here later */

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sleep_common:

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	mflr	r0

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	std	r0, 16(r1)

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	stdu	r1,-64(r1)

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#ifdef CONFIG_PPC_PASEMI_CPUFREQ

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	std	r3, 48(r1)

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	/* Only do power savings when in astate 0 */

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	bl	check_astate

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	cmpwi	r3,0

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	bne	1f

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	ld	r3, 48(r1)

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#endif

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	LOAD_REG_IMMEDIATE(r6,MSR_DR|MSR_IR|MSR_ME|MSR_EE)

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	mfmsr	r4

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	andc	r5,r4,r6

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	mtmsrd	r5,0

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	mtctr	r3

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	bctrl

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	mtmsrd	r4,0

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1:	addi	r1,r1,64

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	ld	r0,16(r1)

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	mtlr	r0

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	blr

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