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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 "map.h"
|
| #include "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
|
|
