Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/platforms/pasemi/powersave.S
10819 views
1
/*

2
 * Copyright (C) 2006-2007 PA Semi, Inc

3
 *

4
 * Maintained by: Olof Johansson <[email protected]>

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);	\

43
1:	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


61
sleep_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


85
1:	addi	r1,r1,64

86
	ld	r0,16(r1)

87
	mtlr	r0

88
	blr

89


90


91