1/* linux/arch/arm/mach-s3c2410/sleep.S
2 *
3 * Copyright (c) 2004 Simtec Electronics
4 *	Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2410 Power Manager (Suspend-To-RAM) support
7 *
8 * Based on PXA/SA1100 sleep code by:
9 *	Nicolas Pitre, (c) 2002 Monta Vista Software Inc
10 *	Cliff Brake, (c) 2001
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25*/
26
27#include <linux/linkage.h>
28#include <linux/serial_s3c.h>
29#include <asm/assembler.h>
30#include <mach/hardware.h>
31#include <mach/map.h>
32
33#include <mach/regs-gpio.h>
34#include <mach/regs-clock.h>
35
36#include "regs-mem.h"
37
38	/* s3c2410_cpu_suspend
39	 *
40	 * put the cpu into sleep mode
41	*/
42
43ENTRY(s3c2410_cpu_suspend)
44	@@ prepare cpu to sleep
45
46	ldr	r4, =S3C2410_REFRESH
47	ldr	r5, =S3C24XX_MISCCR
48	ldr	r6, =S3C2410_CLKCON
49	ldr	r7, [r4]		@ get REFRESH (and ensure in TLB)
50	ldr	r8, [r5]		@ get MISCCR (and ensure in TLB)
51	ldr	r9, [r6]		@ get CLKCON (and ensure in TLB)
52
53	orr	r7, r7, #S3C2410_REFRESH_SELF	@ SDRAM sleep command
54	orr	r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals
55	orr	r9, r9, #S3C2410_CLKCON_POWER	@ power down command
56
57	teq	pc, #0			@ first as a trial-run to load cache
58	bl	s3c2410_do_sleep
59	teq	r0, r0			@ now do it for real
60	b	s3c2410_do_sleep	@
61
62	@@ align next bit of code to cache line
63	.align	5
64s3c2410_do_sleep:
65	streq	r7, [r4]			@ SDRAM sleep command
66	streq	r8, [r5]			@ SDRAM power-down config
67	streq	r9, [r6]			@ CPU sleep
681:	beq	1b
69	ret	lr
70