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 be self-contained.
16 * this code will be copied to on-chip memory and executed from there.
17 */
18 .balign 4
19ENTRY(ecovec24_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
32ENTRY(ecovec24_sdram_enter_end)
33
34 .balign 4
35ENTRY(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 mode */
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
53resume_rstandby:
54
55 /* DBSC: re-initialize and put in auto-refresh */
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
69WAIT_400NS:
70 dt r0
71 bf WAIT_400NS
72
73 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
74 ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */
75 ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */
76 ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */
77 ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */
78 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
79 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
80 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
81 ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */
82 ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */
83 ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */
84
85 mov #100,r0
86WAIT_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 read */
96
97 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
98 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
99 ED 0xFD000108, 0x00000080 /* DBPDCNT0 */
100 ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
101
102 rts
103 nop
104
105 .balign 4
106DUMMY: .long 0xac400000
107
108ENTRY(ecovec24_sdram_leave_end)
109

source code of linux/arch/sh/boards/mach-ecovec24/sdram.S