70 lines
1.4 KiB
ArmAsm
70 lines
1.4 KiB
ArmAsm
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/* 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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/*
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* S3C24XX_DEBUG_RESUME is dangerous if your bootloader does not
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* reset the UART configuration, only enable if you really need this!
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*/
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//#define S3C24XX_DEBUG_RESUME
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.text
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/* sleep magic, to allow the bootloader to check for an valid
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* image to resume to. Must be the first word before the
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* s3c_cpu_resume entry.
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*/
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.word 0x2bedf00d
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/* s3c_cpu_resume
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*
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* resume code entry for bootloader to call
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*/
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ENTRY(s3c_cpu_resume)
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mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE
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msr cpsr_c, r0
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@@ load UART to allow us to print the two characters for
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@@ resume debug
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mov r2, #S3C24XX_PA_UART & 0xff000000
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orr r2, r2, #S3C24XX_PA_UART & 0xff000
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#if 0
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/* SMDK2440 LED set */
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mov r14, #S3C24XX_PA_GPIO
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ldr r12, [ r14, #0x54 ]
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bic r12, r12, #3<<4
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orr r12, r12, #1<<7
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str r12, [ r14, #0x54 ]
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#endif
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#ifdef S3C24XX_DEBUG_RESUME
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mov r3, #'L'
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strb r3, [ r2, #S3C2410_UTXH ]
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1001:
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ldrb r14, [ r3, #S3C2410_UTRSTAT ]
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tst r14, #S3C2410_UTRSTAT_TXE
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beq 1001b
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#endif /* S3C24XX_DEBUG_RESUME */
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b cpu_resume
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