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 |
19 | ENTRY(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 | |
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 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 | |
53 | resume_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 |
69 | WAIT_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 |
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 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 |
106 | DUMMY: .long 0xac400000 |
107 | |
108 | ENTRY(ecovec24_sdram_leave_end) |
109 | |