linux/arch/arm/mach-s3c24xx/sleep-s3c2412.S
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   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        ret     lr
  69