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/arch/sh/boards/mach-kfr2r09/sdram.S

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
Assembly | 80 lines | 64 code | 16 blank | 0 comment | 1 complexity | ffbe8bb4672398c6b37fc6feea463755 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 1/*
 2 * KFR2R09 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(kfr2r09_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(kfr2r09_sdram_enter_end)
36
37	.balign 4
38ENTRY(kfr2r09_sdram_leave_start)
39
40	/* DBSC: put memory in auto-refresh mode */
41
42	mov.l	@(SH_SLEEP_MODE, r5), r0
43	tst	#SUSP_SH_RSTANDBY, r0
44	bf	resume_rstandby
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, 0x40000301 /* DBPDCNT0 */
61	ED 0xFD000020, 0x011B0002 /* DBCONF */
62	ED 0xFD000030, 0x03060E02 /* DBTR0 */
63	ED 0xFD000034, 0x01020102 /* DBTR1 */
64	ED 0xFD000038, 0x01090406 /* DBTR2 */
65	ED 0xFD000008, 0x00000004 /* DBKIND */
66	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
67	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
68	ED 0xFD000018, 0x00000001 /* DBCKECNT */
69	WAIT 1
70	ED 0xFD000010, 0x00000001 /* DBEN */
71	ED 0xFD000044, 0x000004AF /* DBRFPDN1 */
72	ED 0xFD000048, 0x20CF0037 /* DBRFPDN2 */
73	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
74	ED 0xFD000108, 0x40000300 /* DBPDCNT0 */
75	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
76
77	rts
78	 nop
79
80ENTRY(kfr2r09_sdram_leave_end)