[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / kernel / idle_power4.S

/*
 *  This file contains the power_save function for 970-family CPUs.
 *
 *  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/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>
#include <asm/irqflags.h>

#undef DEBUG

	.text

_GLOBAL(power4_idle)
BEGIN_FTR_SECTION
	blr
END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
	/* Now check if user or arch enabled NAP mode */
	LOAD_REG_ADDRBASE(r3,powersave_nap)
	lwz	r4,ADDROFF(powersave_nap)(r3)
	cmpwi	0,r4,0
	beqlr

	/* Hard disable interrupts */
	mfmsr	r7
	rldicl	r0,r7,48,1
	rotldi	r0,r0,16
	mtmsrd	r0,1

	/* Check if something happened while soft-disabled */
	lbz	r0,PACAIRQHAPPENED(r13)
	cmpwi	cr0,r0,0
	bnelr

	/* Soft-enable interrupts */
#ifdef CONFIG_TRACE_IRQFLAGS
	mflr	r0
	std	r0,16(r1)
	stdu    r1,-128(r1)
	bl	.trace_hardirqs_on
	addi    r1,r1,128
	ld	r0,16(r1)
	mtlr	r0
	mfmsr	r7
#endif /* CONFIG_TRACE_IRQFLAGS */

	li	r0,1
	stb	r0,PACASOFTIRQEN(r13)	/* we'll hard-enable shortly */
BEGIN_FTR_SECTION
	DSSALL
	sync
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
	CURRENT_THREAD_INFO(r9, r1)
	ld	r8,TI_LOCAL_FLAGS(r9)	/* set napping bit */
	ori	r8,r8,_TLF_NAPPING	/* so when we take an exception */
	std	r8,TI_LOCAL_FLAGS(r9)	/* it will return to our caller */
	ori	r7,r7,MSR_EE
	oris	r7,r7,MSR_POW@h
1:	sync
	isync
	mtmsrd	r7
	isync
	b	1b
Commit	Line	Data
1da177e4	1	/*
ff2e6d7e	2	* This file contains the power_save function for 970-family CPUs.
1da177e4 LT	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*/
	9
1da177e4 LT	10	#include <linux/threads.h>
	11	#include <asm/processor.h>
	12	#include <asm/page.h>
	13	#include <asm/cputable.h>
	14	#include <asm/thread_info.h>
	15	#include <asm/ppc_asm.h>
0013a854	16	#include <asm/asm-offsets.h>
7230c564	17	#include <asm/irqflags.h>
1da177e4 LT	18
	19	#undef DEBUG
	20
	21	.text
	22
1da177e4 LT	23	_GLOBAL(power4_idle)
	24	BEGIN_FTR_SECTION
	25	blr
	26	END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
1da177e4	27	/* Now check if user or arch enabled NAP mode */
e58c3495 DG	28	LOAD_REG_ADDRBASE(r3,powersave_nap)
e58c3495 DG	29	lwz r4,ADDROFF(powersave_nap)(r3)
1da177e4 LT	30	cmpwi 0,r4,0
	31	beqlr
	32
7230c564	33	/* Hard disable interrupts */
d04c56f7 PM	34	mfmsr r7
	35	rldicl r0,r7,48,1
	36	rotldi r0,r0,16
7230c564 BH	37	mtmsrd r0,1
	38
	39	/* Check if something happened while soft-disabled */
	40	lbz r0,PACAIRQHAPPENED(r13)
	41	cmpwi cr0,r0,0
	42	bnelr
	43
	44	/* Soft-enable interrupts */
	45	#ifdef CONFIG_TRACE_IRQFLAGS
	46	mflr r0
	47	std r0,16(r1)
	48	stdu r1,-128(r1)
	49	bl .trace_hardirqs_on
	50	addi r1,r1,128
	51	ld r0,16(r1)
	52	mtlr r0
01e8ec44	53	mfmsr r7
7230c564 BH	54	#endif /* CONFIG_TRACE_IRQFLAGS */
7230c564 BH	55
d04c56f7 PM	56	li r0,1
d04c56f7 PM	57	stb r0,PACASOFTIRQEN(r13) /* we'll hard-enable shortly */
1da177e4 LT	58	BEGIN_FTR_SECTION
	59	DSSALL
	60	sync
	61	END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
9778b696	62	CURRENT_THREAD_INFO(r9, r1)
f39224a8 PM	63	ld r8,TI_LOCAL_FLAGS(r9) /* set napping bit */
	64	ori r8,r8,_TLF_NAPPING /* so when we take an exception */
	65	std r8,TI_LOCAL_FLAGS(r9) /* it will return to our caller */
ff2e6d7e	66	ori r7,r7,MSR_EE
1da177e4	67	oris r7,r7,MSR_POW@h
f39224a8	68	1: sync
1da177e4 LT	69	isync
	70	mtmsrd r7
	71	isync
f39224a8 PM	72	b 1b
f39224a8 PM	73