1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * Copyright (c) 2004 Simtec Electronics 4 * Ben Dooks <ben@simtec.co.uk> 5 * 6 * S3C2410 Power Manager (Suspend-To-RAM) support 7 * 8 * Based on PXA/SA1100 sleep code by: 9 * Nicolas Pitre, (c) 2002 Monta Vista Software Inc 10 * Cliff Brake, (c) 2001 11 */ 12 13#include <linux/linkage.h> 14#include <linux/serial_s3c.h> 15#include <asm/assembler.h> 16#include <mach/hardware.h> 17#include <mach/map.h> 18 19#include <mach/regs-gpio.h> 20#include <mach/regs-clock.h> 21 22/* 23 * S3C24XX_DEBUG_RESUME is dangerous if your bootloader does not 24 * reset the UART configuration, only enable if you really need this! 25 */ 26//#define S3C24XX_DEBUG_RESUME 27 28 .text 29 30 /* sleep magic, to allow the bootloader to check for an valid 31 * image to resume to. Must be the first word before the 32 * s3c_cpu_resume entry. 33 */ 34 35 .word 0x2bedf00d 36 37 /* s3c_cpu_resume 38 * 39 * resume code entry for bootloader to call 40 */ 41 42ENTRY(s3c_cpu_resume) 43 mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE 44 msr cpsr_c, r0 45 46 @@ load UART to allow us to print the two characters for 47 @@ resume debug 48 49 mov r2, #S3C24XX_PA_UART & 0xff000000 50 orr r2, r2, #S3C24XX_PA_UART & 0xff000 51 52#if 0 53 /* SMDK2440 LED set */ 54 mov r14, #S3C24XX_PA_GPIO 55 ldr r12, [ r14, #0x54 ] 56 bic r12, r12, #3<<4 57 orr r12, r12, #1<<7 58 str r12, [ r14, #0x54 ] 59#endif 60 61#ifdef S3C24XX_DEBUG_RESUME 62 mov r3, #'L' 63 strb r3, [ r2, #S3C2410_UTXH ] 641001: 65 ldrb r14, [ r3, #S3C2410_UTRSTAT ] 66 tst r14, #S3C2410_UTRSTAT_TXE 67 beq 1001b 68#endif /* S3C24XX_DEBUG_RESUME */ 69 70 b cpu_resume 71