arch/sh/boards/mach-kfr2r09/sdram.S

   1 /*
   2  * KFR2R09 sdram self/auto-refresh setup code
   3  *
   4  *  Copyright (C) 2009 Magnus Damm
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/sys.h>
  12 #include <linux/errno.h>
  13 #include <linux/linkage.h>
  14 #include <asm/asm-offsets.h>
  15 #include <asm/suspend.h>
  16 #include <asm/romimage-macros.h>
  17
  18 /* code to enter and leave self-refresh. must be self-contained.
  19  * this code will be copied to on-chip memory and executed from there.
  20  */
  21         .balign 4
  22 ENTRY(kfr2r09_sdram_enter_start)
  23
  24         /* DBSC: put memory in self-refresh mode */
  25
  26         ED 0xFD000010, 0x00000000 /* DBEN */
  27         ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  28         ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
  29         ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
  30         ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
  31
  32         rts
  33          nop
  34
  35 ENTRY(kfr2r09_sdram_enter_end)
  36
  37         .balign 4
  38 ENTRY(kfr2r09_sdram_leave_start)
  39
  40         /* DBSC: put memory in auto-refresh mode */
  41
  42         ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  43         WAIT 1
  44         ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
  45         ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
  46         ED 0xFD000010, 0x00000001 /* DBEN */
  47         ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
  48
  49         rts
  50          nop
  51
  52 ENTRY(kfr2r09_sdram_leave_end)