1/* linux/arch/arm/mach-s3c2412/sleep.S 2 * 3 * Copyright (c) 2007 Simtec Electronics 4 * Ben Dooks <ben@simtec.co.uk> 5 * 6 * S3C2412 Power Manager low-level sleep support 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21*/ 22 23#include <linux/linkage.h> 24#include <asm/assembler.h> 25#include <mach/hardware.h> 26#include <mach/map.h> 27 28#include <mach/regs-irq.h> 29 30 .text 31 32 .global s3c2412_sleep_enter 33 34s3c2412_sleep_enter: 35 mov r0, #0 /* argument for coprocessors */ 36 ldr r1, =S3C2410_INTPND 37 ldr r2, =S3C2410_SRCPND 38 ldr r3, =S3C2410_EINTPEND 39 40 teq r0, r0 41 bl s3c2412_sleep_enter1 42 teq pc, r0 43 bl s3c2412_sleep_enter1 44 45 .align 5 46 47 /* this is called twice, first with the Z flag to ensure that the 48 * instructions have been loaded into the cache, and the second 49 * time to try and suspend the system. 50 */ 51s3c2412_sleep_enter1: 52 mcr p15, 0, r0, c7, c10, 4 53 mcrne p15, 0, r0, c7, c0, 4 54 55 /* if we return from here, it is because an interrupt was 56 * active when we tried to shutdown. Try and ack the IRQ and 57 * retry, as simply returning causes the system to lock. 58 */ 59 60 ldrne r9, [ r1 ] 61 strne r9, [ r1 ] 62 ldrne r9, [ r2 ] 63 strne r9, [ r2 ] 64 ldrne r9, [ r3 ] 65 strne r9, [ r3 ] 66 bne s3c2412_sleep_enter1 67 68 mov pc, r14 69