1/* linux/arch/arm/mach-exynos4/sleep.S
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 *		http://www.samsung.com
5 *
6 * EXYNOS4210 power Manager (Suspend-To-RAM) support
7 * Based on S3C2410 sleep code by:
8 *	Ben Dooks, (c) 2004 Simtec Electronics
9 *
10 * Based on PXA/SA1100 sleep code by:
11 *	Nicolas Pitre, (c) 2002 Monta Vista Software Inc
12 *	Cliff Brake, (c) 2001
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27*/
28
29#include <linux/linkage.h>
30#include <asm/assembler.h>
31#include <asm/memory.h>
32
33	.text
34
35	/*
36	 * s3c_cpu_save
37	 *
38	 * entry:
39	 *	r1 = v:p offset
40	 */
41
42ENTRY(s3c_cpu_save)
43
44	stmfd	sp!, { r3 - r12, lr }
45	ldr	r3, =resume_with_mmu
46	bl	cpu_suspend
47
48	ldr	r0, =pm_cpu_sleep
49	ldr	r0, [ r0 ]
50	mov	pc, r0
51
52resume_with_mmu:
53	ldmfd	sp!, { r3 - r12, pc }
54
55	.ltorg
56
57	/*
58	 * sleep magic, to allow the bootloader to check for an valid
59	 * image to resume to. Must be the first word before the
60	 * s3c_cpu_resume entry.
61	 */
62
63	.word	0x2bedf00d
64
65	/*
66	 * s3c_cpu_resume
67	 *
68	 * resume code entry for bootloader to call
69	 *
70	 * we must put this code here in the data segment as we have no
71	 * other way of restoring the stack pointer after sleep, and we
72	 * must not write to the code segment (code is read-only)
73	 */
74
75ENTRY(s3c_cpu_resume)
76	b	cpu_resume
77