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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * Copyright (c) 2007 Simtec Electronics
- * Ben Dooks <ben@simtec.co.uk>
- *
- * S3C2412 Power Manager low-level sleep support
- */
- #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
- ret lr
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