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69 lines
1.4 KiB
69 lines
1.4 KiB
/* 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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