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/* linux/arch/arm/mach-s3c2412/sleep.S
*
* Copyright (c) 2007 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* S3C2412 Power Manager low-level sleep support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <mach/hardware.h>
#include <mach/map.h>
#include <mach/regs-irq.h>
.text
.global s3c2412_sleep_enter
s3c2412_sleep_enter:
mov r0, #0 /* argument for coprocessors */
ldr r1, =S3C2410_INTPND
ldr r2, =S3C2410_SRCPND
ldr r3, =S3C2410_EINTPEND
teq r0, r0
bl s3c2412_sleep_enter1
teq pc, r0
bl s3c2412_sleep_enter1
.align 5
/* this is called twice, first with the Z flag to ensure that the
* instructions have been loaded into the cache, and the second
* time to try and suspend the system.
*/
s3c2412_sleep_enter1:
mcr p15, 0, r0, c7, c10, 4
mcrne p15, 0, r0, c7, c0, 4
/* if we return from here, it is because an interrupt was
* active when we tried to shutdown. Try and ack the IRQ and
* retry, as simply returning causes the system to lock.
*/
ldrne r9, [ r1 ]
strne r9, [ r1 ]
ldrne r9, [ r2 ]
strne r9, [ r2 ]
ldrne r9, [ r3 ]
strne r9, [ r3 ]
bne s3c2412_sleep_enter1
mov pc, r14
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