55 lines
1.3 KiB
ArmAsm
55 lines
1.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2004 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2410 Power Manager (Suspend-To-RAM) support
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*
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* Based on PXA/SA1100 sleep code by:
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* Nicolas Pitre, (c) 2002 Monta Vista Software Inc
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* Cliff Brake, (c) 2001
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*/
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#include <linux/linkage.h>
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#include <linux/serial_s3c.h>
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#include <asm/assembler.h>
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#include "map.h"
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#include "regs-gpio.h"
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#include "regs-clock.h"
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#include "regs-mem-s3c24xx.h"
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/* s3c2410_cpu_suspend
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*
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* put the cpu into sleep mode
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*/
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ENTRY(s3c2410_cpu_suspend)
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@@ prepare cpu to sleep
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ldr r4, =S3C2410_REFRESH
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ldr r5, =S3C24XX_MISCCR
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ldr r6, =S3C2410_CLKCON
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ldr r7, [r4] @ get REFRESH (and ensure in TLB)
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ldr r8, [r5] @ get MISCCR (and ensure in TLB)
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ldr r9, [r6] @ get CLKCON (and ensure in TLB)
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orr r7, r7, #S3C2410_REFRESH_SELF @ SDRAM sleep command
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orr r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals
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orr r9, r9, #S3C2410_CLKCON_POWER @ power down command
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teq pc, #0 @ first as a trial-run to load cache
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bl s3c2410_do_sleep
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teq r0, r0 @ now do it for real
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b s3c2410_do_sleep @
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@@ align next bit of code to cache line
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.align 5
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s3c2410_do_sleep:
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streq r7, [r4] @ SDRAM sleep command
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streq r8, [r5] @ SDRAM power-down config
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streq r9, [r6] @ CPU sleep
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1: beq 1b
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ret lr
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