| Ben Dooks | 3323495 | 2007-12-23 03:09:34 +0100 | [diff] [blame] | 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 <asm/hardware.h> |
| 26 | #include <asm/arch/map.h> |
| 27 | |
| 28 | #include <asm/arch/regs-irq.h> |
| 29 | |
| 30 | .text |
| 31 | |
| 32 | .global s3c2412_sleep_enter |
| 33 | |
| 34 | s3c2412_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 | */ |
| 51 | s3c2412_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 |