1 /* SPDX-License-Identifier: GPL-2.0
2 *
3 * Ecovec24 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
16 * this code will be copied to on-chip memory
17 */
18 .balign 4
19 ENTRY(ecovec24_sdram_enter_start)
20
21 /* DBSC: put memory in self-refresh mo
22
23 ED 0xFD000010, 0x00000000 /* DBEN */
24 ED 0xFD000040, 0x00000000 /* DBRFPDN0
25 ED 0xFD000014, 0x00000002 /* DBCMDCNT
26 ED 0xFD000014, 0x00000004 /* DBCMDCNT
27 ED 0xFD000040, 0x00000001 /* DBRFPDN0
28
29 rts
30 nop
31
32 ENTRY(ecovec24_sdram_enter_end)
33
34 .balign 4
35 ENTRY(ecovec24_sdram_leave_start)
36
37 mov.l @(SH_SLEEP_MODE, r5), r0
38 tst #SUSP_SH_RSTANDBY, r0
39 bf resume_rstandby
40
41 /* DBSC: put memory in auto-refresh mo
42
43 ED 0xFD000040, 0x00000000 /* DBRFPDN0
44 WAIT 1
45 ED 0xFD000014, 0x00000002 /* DBCMDCNT
46 ED 0xFD000014, 0x00000004 /* DBCMDCNT
47 ED 0xFD000010, 0x00000001 /* DBEN */
48 ED 0xFD000040, 0x00010000 /* DBRFPDN0
49
50 rts
51 nop
52
53 resume_rstandby:
54
55 /* DBSC: re-initialize and put in auto
56
57 ED 0xFD000108, 0x00000181 /* DBPDCNT0
58 ED 0xFD000020, 0x015B0002 /* DBCONF */
59 ED 0xFD000030, 0x03071502 /* DBTR0 */
60 ED 0xFD000034, 0x02020102 /* DBTR1 */
61 ED 0xFD000038, 0x01090405 /* DBTR2 */
62 ED 0xFD00003C, 0x00000002 /* DBTR3 */
63 ED 0xFD000008, 0x00000005 /* DBKIND */
64 ED 0xFD000040, 0x00000001 /* DBRFPDN0
65 ED 0xFD000040, 0x00000000 /* DBRFPDN0
66 ED 0xFD000018, 0x00000001 /* DBCKECNT
67
68 mov #100,r0
69 WAIT_400NS:
70 dt r0
71 bf WAIT_400NS
72
73 ED 0xFD000014, 0x00000002 /* DBCMDCNT
74 ED 0xFD000060, 0x00020000 /* DBMRCNT (
75 ED 0xFD000060, 0x00030000 /* DBMRCNT (
76 ED 0xFD000060, 0x00010004 /* DBMRCNT (
77 ED 0xFD000060, 0x00000532 /* DBMRCNT (
78 ED 0xFD000014, 0x00000002 /* DBCMDCNT
79 ED 0xFD000014, 0x00000004 /* DBCMDCNT
80 ED 0xFD000014, 0x00000004 /* DBCMDCNT
81 ED 0xFD000060, 0x00000432 /* DBMRCNT (
82 ED 0xFD000060, 0x000103c0 /* DBMRCNT (
83 ED 0xFD000060, 0x00010040 /* DBMRCNT (
84
85 mov #100,r0
86 WAIT_400NS_2:
87 dt r0
88 bf WAIT_400NS_2
89
90 ED 0xFD000010, 0x00000001 /* DBEN */
91 ED 0xFD000044, 0x0000050f /* DBRFPDN1
92 ED 0xFD000048, 0x236800e6 /* DBRFPDN2
93
94 mov.l DUMMY,r0
95 mov.l @r0, r1 /* force single dummy
96
97 ED 0xFD000014, 0x00000002 /* DBCMDCNT
98 ED 0xFD000014, 0x00000004 /* DBCMDCNT
99 ED 0xFD000108, 0x00000080 /* DBPDCNT0
100 ED 0xFD000040, 0x00010000 /* DBRFPDN0
101
102 rts
103 nop
104
105 .balign 4
106 DUMMY: .long 0xac400000
107
108 ENTRY(ecovec24_sdram_leave_end)
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