LXR linux/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
  22ENTRY(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
  35ENTRY(kfr2r09_sdram_enter_end)
  36
  37        .balign 4
  38ENTRY(kfr2r09_sdram_leave_start)
  39
  40        /* DBSC: put memory in auto-refresh mode */
  41
  42        mov.l   @(SH_SLEEP_MODE, r5), r0
  43        tst     #SUSP_SH_RSTANDBY, r0
  44        bf      resume_rstandby
  45
  46        ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  47        WAIT 1
  48        ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
  49        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
  50        ED 0xFD000010, 0x00000001 /* DBEN */
  51        ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
  52
  53        rts
  54         nop
  55
  56resume_rstandby:
  57
  58        /* DBSC: re-initialize and put in auto-refresh */
  59
  60        ED 0xFD000108, 0x40000301 /* DBPDCNT0 */
  61        ED 0xFD000020, 0x011B0002 /* DBCONF */
  62        ED 0xFD000030, 0x03060E02 /* DBTR0 */
  63        ED 0xFD000034, 0x01020102 /* DBTR1 */
  64        ED 0xFD000038, 0x01090406 /* DBTR2 */
  65        ED 0xFD000008, 0x00000004 /* DBKIND */
  66        ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
  67        ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  68        ED 0xFD000018, 0x00000001 /* DBCKECNT */
  69        WAIT 1
  70        ED 0xFD000010, 0x00000001 /* DBEN */
  71        ED 0xFD000044, 0x000004AF /* DBRFPDN1 */
  72        ED 0xFD000048, 0x20CF0037 /* DBRFPDN2 */
  73        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
  74        ED 0xFD000108, 0x40000300 /* DBPDCNT0 */
  75        ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
  76
  77        rts
  78         nop
  79
  80ENTRY(kfr2r09_sdram_leave_end)
  81