| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright (c) 2004 Simtec Electronics |
| * Ben Dooks <ben@simtec.co.uk> |
| * |
| * S3C2410 Power Manager (Suspend-To-RAM) support |
| * |
| * Based on PXA/SA1100 sleep code by: |
| * Nicolas Pitre, (c) 2002 Monta Vista Software Inc |
| * Cliff Brake, (c) 2001 |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/serial_s3c.h> |
| #include <asm/assembler.h> |
| #include <mach/hardware.h> |
| #include <mach/map.h> |
| |
| #include <mach/regs-gpio.h> |
| #include <mach/regs-clock.h> |
| |
| /* |
| * S3C24XX_DEBUG_RESUME is dangerous if your bootloader does not |
| * reset the UART configuration, only enable if you really need this! |
| */ |
| //#define S3C24XX_DEBUG_RESUME |
| |
| .text |
| |
| /* sleep magic, to allow the bootloader to check for an valid |
| * image to resume to. Must be the first word before the |
| * s3c_cpu_resume entry. |
| */ |
| |
| .word 0x2bedf00d |
| |
| /* s3c_cpu_resume |
| * |
| * resume code entry for bootloader to call |
| */ |
| |
| ENTRY(s3c_cpu_resume) |
| mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE |
| msr cpsr_c, r0 |
| |
| @@ load UART to allow us to print the two characters for |
| @@ resume debug |
| |
| mov r2, #S3C24XX_PA_UART & 0xff000000 |
| orr r2, r2, #S3C24XX_PA_UART & 0xff000 |
| |
| #if 0 |
| /* SMDK2440 LED set */ |
| mov r14, #S3C24XX_PA_GPIO |
| ldr r12, [ r14, #0x54 ] |
| bic r12, r12, #3<<4 |
| orr r12, r12, #1<<7 |
| str r12, [ r14, #0x54 ] |
| #endif |
| |
| #ifdef S3C24XX_DEBUG_RESUME |
| mov r3, #'L' |
| strb r3, [ r2, #S3C2410_UTXH ] |
| 1001: |
| ldrb r14, [ r3, #S3C2410_UTRSTAT ] |
| tst r14, #S3C2410_UTRSTAT_TXE |
| beq 1001b |
| #endif /* S3C24XX_DEBUG_RESUME */ |
| |
| b cpu_resume |