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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * Copyright (c) 2004 Simtec Electronics
- * Ben Dooks <[email protected]>
- *
- * 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 "map.h"
- #include "regs-gpio.h"
- #include "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
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