1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * KFR2R09 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(kfr2r09_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(kfr2r09_sdram_enter_end)
33
34	.balign 4
35ENTRY(kfr2r09_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
53resume_rstandby:
54
55	/* DBSC: re-initialize and put in auto-refresh */
56
57	ED 0xFD000108, 0x40000301 /* DBPDCNT0 */
58	ED 0xFD000020, 0x011B0002 /* DBCONF */
59	ED 0xFD000030, 0x03060E02 /* DBTR0 */
60	ED 0xFD000034, 0x01020102 /* DBTR1 */
61	ED 0xFD000038, 0x01090406 /* DBTR2 */
62	ED 0xFD000008, 0x00000004 /* DBKIND */
63	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
64	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
65	ED 0xFD000018, 0x00000001 /* DBCKECNT */
66	WAIT 1
67	ED 0xFD000010, 0x00000001 /* DBEN */
68	ED 0xFD000044, 0x000004AF /* DBRFPDN1 */
69	ED 0xFD000048, 0x20CF0037 /* DBRFPDN2 */
70	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
71	ED 0xFD000108, 0x40000300 /* DBPDCNT0 */
72	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
73
74	rts
75	 nop
76
77ENTRY(kfr2r09_sdram_leave_end)
78