Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/boards/mach-se/7724/sdram.S
26513 views
1
/* SPDX-License-Identifier: GPL-2.0

2
 *

3
 * MS7724SE sdram self/auto-refresh setup code

4
 *

5
 *  Copyright (C) 2009 Magnus Damm

6
 */

7


8
#include <linux/sys.h>

9
#include <linux/errno.h>

10
#include <linux/linkage.h>

11
#include <asm/asm-offsets.h>

12
#include <asm/suspend.h>

13
#include <asm/romimage-macros.h>

14


15
/* code to enter and leave self-refresh. must be self-contained.

16
 * this code will be copied to on-chip memory and executed from there.

17
 */

18
	.balign 4

19
ENTRY(ms7724se_sdram_enter_start)

20


21
	/* DBSC: put memory in self-refresh mode */

22


23
	ED 0xFD000010, 0x00000000 /* DBEN */

24
	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */

25
	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

26
	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

27
	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */

28


29
	rts

30
	 nop

31


32
ENTRY(ms7724se_sdram_enter_end)

33


34
	.balign 4

35
ENTRY(ms7724se_sdram_leave_start)

36


37
	/* DBSC: put memory in auto-refresh mode */

38


39
	mov.l	@(SH_SLEEP_MODE, r5), r0

40
	tst	#SUSP_SH_RSTANDBY, r0

41
	bf	resume_rstandby

42


43
	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */

44
	WAIT 1

45
	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

46
	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

47
	ED 0xFD000010, 0x00000001 /* DBEN */

48
	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */

49


50
	rts

51
	 nop

52


53
resume_rstandby:

54


55
	/* CPG: setup clocks before restarting external memory */

56


57
	ED 0xA4150024, 0x00004000 /* PLLCR */

58


59
	mov.l	FRQCRA,r0

60
	mov.l	@r0,r3

61
	mov.l	KICK,r1

62
	or	r1, r3

63
	mov.l	r3, @r0

64


65
	mov.l	LSTATS,r0

66
	mov	#1,r1

67
WAIT_LSTATS:

68
	mov.l	@r0,r3

69
	tst	r1,r3

70
	bf	WAIT_LSTATS

71


72
	/* DBSC: re-initialize and put in auto-refresh */

73


74
	ED 0xFD000108, 0x00000181 /* DBPDCNT0 */

75
	ED 0xFD000020, 0x015B0002 /* DBCONF */

76
	ED 0xFD000030, 0x03071502 /* DBTR0 */

77
	ED 0xFD000034, 0x02020102 /* DBTR1 */

78
	ED 0xFD000038, 0x01090405 /* DBTR2 */

79
	ED 0xFD00003C, 0x00000002 /* DBTR3 */

80
	ED 0xFD000008, 0x00000005 /* DBKIND */

81
	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */

82
	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */

83
	ED 0xFD000018, 0x00000001 /* DBCKECNT */

84


85
	mov	#100,r0

86
WAIT_400NS:

87
	dt	r0

88
	bf	WAIT_400NS

89


90
	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

91
	ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */

92
	ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */

93
	ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */

94
	ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */

95
	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

96
	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

97
	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

98
	ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */

99
	ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */

100
	ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */

101


102
	mov	#100,r0

103
WAIT_400NS_2:

104
	dt	r0

105
	bf	WAIT_400NS_2

106


107
	ED 0xFD000010, 0x00000001 /* DBEN */

108
	ED 0xFD000044, 0x0000050f /* DBRFPDN1 */

109
	ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */

110


111
	mov.l	DUMMY,r0

112
	mov.l	@r0, r1 /* force single dummy read */

113


114
	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

115
	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

116
	ED 0xFD000108, 0x00000080 /* DBPDCNT0 */

117
	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */

118


119
	rts

120
	 nop

121


122
	.balign 4

123
DUMMY:	.long	0xac400000

124
FRQCRA:	.long	0xa4150000

125
KICK:	.long	0x80000000

126
LSTATS:	.long	0xa4150060

127


128
ENTRY(ms7724se_sdram_leave_end)

129


130