/* linux/arch/arm/mach-s3c2410/sleep.S * * 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 * * 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 <linux/linkage.h> #include <asm/assembler.h> #include <mach/hardware.h> #include <mach/map.h> #include <mach/regs-gpio.h> #include <mach/regs-clock.h> #include <plat/regs-serial.h> #include "regs-mem.h" /* s3c2410_cpu_suspend * * put the cpu into sleep mode */ ENTRY(s3c2410_cpu_suspend) @@ prepare cpu to sleep ldr r4, =S3C2410_REFRESH ldr r5, =S3C24XX_MISCCR ldr r6, =S3C2410_CLKCON ldr r7, [r4] @ get REFRESH (and ensure in TLB) ldr r8, [r5] @ get MISCCR (and ensure in TLB) ldr r9, [r6] @ get CLKCON (and ensure in TLB) orr r7, r7, #S3C2410_REFRESH_SELF @ SDRAM sleep command orr r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals orr r9, r9, #S3C2410_CLKCON_POWER @ power down command teq pc, #0 @ first as a trial-run to load cache bl s3c2410_do_sleep teq r0, r0 @ now do it for real b s3c2410_do_sleep @ @@ align next bit of code to cache line .align 5 s3c2410_do_sleep: streq r7, [r4] @ SDRAM sleep command streq r8, [r5] @ SDRAM power-down config streq r9, [r6] @ CPU sleep 1: beq 1b mov pc, r14