54 lines
1.1 KiB
ArmAsm
54 lines
1.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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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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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include "map.h"
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#include "regs-irq.h"
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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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ret lr
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