Root/arch/arm/mach-s3c2412/sleep.S

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

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