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Uwe Kleine-König58862692007-05-09 07:51:49 +02001/* linux/arch/arm/mach-s3c2410/sleep.S
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/linkage.h>
Tushar Behera334a1c72014-02-14 10:32:45 +090028#include <linux/serial_s3c.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/assembler.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010030#include <mach/hardware.h>
31#include <mach/map.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Russell Kinga09e64f2008-08-05 16:14:15 +010033#include <mach/regs-gpio.h>
34#include <mach/regs-clock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Kukjin Kim37c3adc2013-02-03 17:00:11 -080036#include "regs-mem.h"
37
Ben Dooksa21765a2007-02-11 18:31:01 +010038 /* s3c2410_cpu_suspend
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 *
Ben Dooksa21765a2007-02-11 18:31:01 +010040 * put the cpu into sleep mode
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 */
42
Ben Dooksa21765a2007-02-11 18:31:01 +010043ENTRY(s3c2410_cpu_suspend)
44 @@ prepare cpu to sleep
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Ben Dooksa21765a2007-02-11 18:31:01 +010046 ldr r4, =S3C2410_REFRESH
47 ldr r5, =S3C24XX_MISCCR
48 ldr r6, =S3C2410_CLKCON
Arnd Bergmann28157742013-01-08 21:58:31 +000049 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Ben Dooksa21765a2007-02-11 18:31:01 +010053 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Ben Dooksa21765a2007-02-11 18:31:01 +010057 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 @
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Ben Dooksa21765a2007-02-11 18:31:01 +010062 @@ align next bit of code to cache line
Matt Reimer4b210fa2007-02-12 21:00:32 +010063 .align 5
Ben Dooksa21765a2007-02-11 18:31:01 +010064s3c2410_do_sleep:
Arnd Bergmann28157742013-01-08 21:58:31 +000065 streq r7, [r4] @ SDRAM sleep command
66 streq r8, [r5] @ SDRAM power-down config
67 streq r9, [r6] @ CPU sleep
Ben Dooksa21765a2007-02-11 18:31:01 +0100681: beq 1b
Russell King6ebbf2c2014-06-30 16:29:12 +010069 ret lr