1/*
2 * Ecovec24 sdram self/auto-refresh setup code
3 *
4 *  Copyright (C) 2009 Magnus Damm
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License.  See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11#include <linux/sys.h>
12#include <linux/errno.h>
13#include <linux/linkage.h>
14#include <asm/asm-offsets.h>
15#include <asm/suspend.h>
16#include <asm/romimage-macros.h>
17
18/* code to enter and leave self-refresh. must be self-contained.
19 * this code will be copied to on-chip memory and executed from there.
20 */
21	.balign 4
22ENTRY(ecovec24_sdram_enter_start)
23
24	/* DBSC: put memory in self-refresh mode */
25
26	ED 0xFD000010, 0x00000000 /* DBEN */
27	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
28	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
29	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
30	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
31
32	rts
33	 nop
34
35ENTRY(ecovec24_sdram_enter_end)
36
37	.balign 4
38ENTRY(ecovec24_sdram_leave_start)
39
40	mov.l	@(SH_SLEEP_MODE, r5), r0
41	tst	#SUSP_SH_RSTANDBY, r0
42	bf	resume_rstandby
43
44	/* DBSC: put memory in auto-refresh mode */
45
46	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
47	WAIT 1
48	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
49	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
50	ED 0xFD000010, 0x00000001 /* DBEN */
51	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
52
53	rts
54	 nop
55
56resume_rstandby:
57
58	/* DBSC: re-initialize and put in auto-refresh */
59
60	ED 0xFD000108, 0x00000181 /* DBPDCNT0 */
61	ED 0xFD000020, 0x015B0002 /* DBCONF */
62	ED 0xFD000030, 0x03071502 /* DBTR0 */
63	ED 0xFD000034, 0x02020102 /* DBTR1 */
64	ED 0xFD000038, 0x01090405 /* DBTR2 */
65	ED 0xFD00003C, 0x00000002 /* DBTR3 */
66	ED 0xFD000008, 0x00000005 /* DBKIND */
67	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
68	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
69	ED 0xFD000018, 0x00000001 /* DBCKECNT */
70
71	mov	#100,r0
72WAIT_400NS:
73	dt	r0
74	bf	WAIT_400NS
75
76	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
77	ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */
78	ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */
79	ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */
80	ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */
81	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
82	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
83	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
84	ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */
85	ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */
86	ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */
87
88	mov	#100,r0
89WAIT_400NS_2:
90	dt	r0
91	bf	WAIT_400NS_2
92
93	ED 0xFD000010, 0x00000001 /* DBEN */
94	ED 0xFD000044, 0x0000050f /* DBRFPDN1 */
95	ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */
96
97	mov.l	DUMMY,r0
98	mov.l	@r0, r1 /* force single dummy read */
99
100	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
101	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
102	ED 0xFD000108, 0x00000080 /* DBPDCNT0 */
103	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
104
105	rts
106	 nop
107
108	.balign 4
109DUMMY:	.long	0xac400000
110
111ENTRY(ecovec24_sdram_leave_end)
112