1/*
2 * Copyright (C) 2006-2007 PA Semi, Inc
3 *
4 * Maintained by: Olof Johansson <olof@lixom.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18 *
19 */
20
21#include <asm/processor.h>
22#include <asm/page.h>
23#include <asm/ppc_asm.h>
24#include <asm/cputable.h>
25#include <asm/cache.h>
26#include <asm/thread_info.h>
27#include <asm/asm-offsets.h>
28
29/* Power savings opcodes since not all binutils have them at this time */
30#define DOZE	.long	0x4c000324
31#define NAP	.long	0x4c000364
32#define SLEEP	.long	0x4c0003a4
33#define RVW	.long	0x4c0003e4
34
35/* Common sequence to do before going to any of the
36 * powersavings modes.
37 */
38
39#define PRE_SLEEP_SEQUENCE	\
40	std	r3,8(r1);	\
41	ptesync	;		\
42	ld	r3,8(r1);	\
431:	cmpd 	r3,r3;		\
44	bne	1b
45
46_doze:
47	PRE_SLEEP_SEQUENCE
48	DOZE
49	b	.
50
51
52_GLOBAL(idle_spin)
53	blr
54
55_GLOBAL(idle_doze)
56	LOAD_REG_ADDR(r3, _doze)
57	b	sleep_common
58
59/* Add more modes here later */
60
61sleep_common:
62	mflr	r0
63	std	r0, 16(r1)
64	stdu	r1,-64(r1)
65#ifdef CONFIG_PPC_PASEMI_CPUFREQ
66	std	r3, 48(r1)
67
68	/* Only do power savings when in astate 0 */
69	bl	.check_astate
70	cmpwi	r3,0
71	bne	1f
72
73	ld	r3, 48(r1)
74#endif
75	LOAD_REG_IMMEDIATE(r6,MSR_DR|MSR_IR|MSR_ME|MSR_EE)
76	mfmsr	r4
77	andc	r5,r4,r6
78	mtmsrd	r5,0
79
80	mtctr	r3
81	bctrl
82
83	mtmsrd	r4,0
84
851:	addi	r1,r1,64
86	ld	r0,16(r1)
87	mtlr	r0
88	blr
89
90