From de7bfff1b251395be9a229ee14191105d8d1385d Mon Sep 17 00:00:00 2001 From: Heiko Stuebner Date: Sat, 12 May 2012 16:22:18 +0900 Subject: ARM: S3C24XX: move common power-management code to mach-s3c24xx This is the basic power-management code used by all s3c24xx machines. Signed-off-by: Heiko Stuebner Signed-off-by: Kukjin Kim --- arch/arm/mach-s3c24xx/sleep.S | 84 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 arch/arm/mach-s3c24xx/sleep.S (limited to 'arch/arm/mach-s3c24xx/sleep.S') diff --git a/arch/arm/mach-s3c24xx/sleep.S b/arch/arm/mach-s3c24xx/sleep.S new file mode 100644 index 000000000000..c56612569b40 --- /dev/null +++ b/arch/arm/mach-s3c24xx/sleep.S @@ -0,0 +1,84 @@ +/* linux/arch/arm/plat-s3c24xx/sleep.S + * + * Copyright (c) 2004 Simtec Electronics + * Ben Dooks + * + * 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 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include +#include +#include +#include + +#include +#include +#include +#include + +/* CONFIG_DEBUG_RESUME is dangerous if your bootloader does not + * reset the UART configuration, only enable if you really need this! +*/ +//#define CONFIG_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 CONFIG_DEBUG_RESUME + mov r3, #'L' + strb r3, [ r2, #S3C2410_UTXH ] +1001: + ldrb r14, [ r3, #S3C2410_UTRSTAT ] + tst r14, #S3C2410_UTRSTAT_TXE + beq 1001b +#endif /* CONFIG_DEBUG_RESUME */ + + b cpu_resume -- cgit v1.2.1