2007-12-23 02:09:34 +00:00
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/* linux/arch/arm/mach-s3c2412/sleep.S
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*
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* Copyright (c) 2007 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2412 Power Manager low-level sleep support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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2008-08-05 15:14:15 +00:00
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#include <mach/hardware.h>
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#include <mach/map.h>
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2007-12-23 02:09:34 +00:00
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2008-08-05 15:14:15 +00:00
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#include <mach/regs-irq.h>
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2007-12-23 02:09:34 +00:00
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.text
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.global s3c2412_sleep_enter
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s3c2412_sleep_enter:
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mov r0, #0 /* argument for coprocessors */
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ldr r1, =S3C2410_INTPND
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ldr r2, =S3C2410_SRCPND
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ldr r3, =S3C2410_EINTPEND
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teq r0, r0
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bl s3c2412_sleep_enter1
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teq pc, r0
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bl s3c2412_sleep_enter1
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.align 5
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/* this is called twice, first with the Z flag to ensure that the
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* instructions have been loaded into the cache, and the second
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* time to try and suspend the system.
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*/
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s3c2412_sleep_enter1:
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mcr p15, 0, r0, c7, c10, 4
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mcrne p15, 0, r0, c7, c0, 4
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/* if we return from here, it is because an interrupt was
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* active when we tried to shutdown. Try and ack the IRQ and
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* retry, as simply returning causes the system to lock.
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*/
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ldrne r9, [ r1 ]
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strne r9, [ r1 ]
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ldrne r9, [ r2 ]
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strne r9, [ r2 ]
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ldrne r9, [ r3 ]
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strne r9, [ r3 ]
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bne s3c2412_sleep_enter1
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mov pc, r14
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