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53 lines
1.1 KiB
53 lines
1.1 KiB
/* 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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