arch/arm/mach-s5pv210/sleep.S

   1 /* linux/arch/arm/plat-s5p/sleep.S
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * S5PV210 power Manager (Suspend-To-RAM) support
   7  * Based on S3C2410 sleep code by:
   8  *      Ben Dooks, (c) 2004 Simtec Electronics
   9  *
  10  * Based on PXA/SA1100 sleep code by:
  11  *      Nicolas Pitre, (c) 2002 Monta Vista Software Inc
  12  *      Cliff Brake, (c) 2001
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27 */
  28
  29 #include <linux/linkage.h>
  30 #include <asm/assembler.h>
  31 #include <asm/memory.h>
  32
  33         .text
  34
  35         /* s3c_cpu_save
  36          *
  37          * entry:
  38          *      r1 = v:p offset
  39         */
  40
  41 ENTRY(s3c_cpu_save)
  42
  43         stmfd   sp!, { r3 - r12, lr }
  44         ldr     r3, =resume_with_mmu
  45         bl      cpu_suspend
  46
  47         ldr     r0, =pm_cpu_sleep
  48         ldr     r0, [ r0 ]
  49         mov     pc, r0
  50
  51 resume_with_mmu:
  52         ldmfd   sp!, { r3 - r12, pc }
  53
  54         .ltorg
  55
  56         /* sleep magic, to allow the bootloader to check for an valid
  57          * image to resume to. Must be the first word before the
  58          * s3c_cpu_resume entry.
  59         */
  60
  61         .word   0x2bedf00d
  62
  63         /* s3c_cpu_resume
  64          *
  65          * resume code entry for bootloader to call
  66          *
  67          * we must put this code here in the data segment as we have no
  68          * other way of restoring the stack pointer after sleep, and we
  69          * must not write to the code segment (code is read-only)
  70         */
  71
  72 ENTRY(s3c_cpu_resume)
  73         b       cpu_resume