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

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * KFR2R09 sdram self/auto-refresh setup code
   4  *
   5  *  Copyright (C) 2009 Magnus Damm
   6  */
   7 
   8 #include <linux/sys.h>
   9 #include <linux/errno.h>
  10 #include <linux/linkage.h>
  11 #include <asm/asm-offsets.h>
  12 #include <asm/suspend.h>
  13 #include <asm/romimage-macros.h>
  14 
  15 /* code to enter and leave self-refresh. must be self-contained.
  16  * this code will be copied to on-chip memory and executed from there.
  17  */
  18         .balign 4
  19 ENTRY(kfr2r09_sdram_enter_start)
  20 
  21         /* DBSC: put memory in self-refresh mode */
  22 
  23         ED 0xFD000010, 0x00000000 /* DBEN */
  24         ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  25         ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
  26         ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
  27         ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
  28 
  29         rts
  30          nop
  31 
  32 ENTRY(kfr2r09_sdram_enter_end)
  33 
  34         .balign 4
  35 ENTRY(kfr2r09_sdram_leave_start)
  36 
  37         /* DBSC: put memory in auto-refresh mode */
  38 
  39         mov.l   @(SH_SLEEP_MODE, r5), r0
  40         tst     #SUSP_SH_RSTANDBY, r0
  41         bf      resume_rstandby
  42 
  43         ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  44         WAIT 1
  45         ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
  46         ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
  47         ED 0xFD000010, 0x00000001 /* DBEN */
  48         ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
  49 
  50         rts
  51          nop
  52 
  53 resume_rstandby:
  54 
  55         /* DBSC: re-initialize and put in auto-refresh */
  56 
  57         ED 0xFD000108, 0x40000301 /* DBPDCNT0 */
  58         ED 0xFD000020, 0x011B0002 /* DBCONF */
  59         ED 0xFD000030, 0x03060E02 /* DBTR0 */
  60         ED 0xFD000034, 0x01020102 /* DBTR1 */
  61         ED 0xFD000038, 0x01090406 /* DBTR2 */
  62         ED 0xFD000008, 0x00000004 /* DBKIND */
  63         ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
  64         ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  65         ED 0xFD000018, 0x00000001 /* DBCKECNT */
  66         WAIT 1
  67         ED 0xFD000010, 0x00000001 /* DBEN */
  68         ED 0xFD000044, 0x000004AF /* DBRFPDN1 */
  69         ED 0xFD000048, 0x20CF0037 /* DBRFPDN2 */
  70         ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
  71         ED 0xFD000108, 0x40000300 /* DBPDCNT0 */
  72         ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
  73 
  74         rts
  75          nop
  76 
  77 ENTRY(kfr2r09_sdram_leave_end)