LXR linux/arch/sh/boards/mach-se/7724/sdram.S

   1/*
   2 * MS7724SE 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(ms7724se_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(ms7724se_sdram_enter_end)
  36
  37        .balign 4
  38ENTRY(ms7724se_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        /* CPG: setup clocks before restarting external memory */
  59
  60        ED 0xA4150024, 0x00004000 /* PLLCR */
  61
  62        mov.l   FRQCRA,r0
  63        mov.l   @r0,r3
  64        mov.l   KICK,r1
  65        or      r1, r3
  66        mov.l   r3, @r0
  67
  68        mov.l   LSTATS,r0
  69        mov     #1,r1
  70WAIT_LSTATS:
  71        mov.l   @r0,r3
  72        tst     r1,r3
  73        bf      WAIT_LSTATS
  74
  75        /* DBSC: re-initialize and put in auto-refresh */
  76
  77        ED 0xFD000108, 0x00000181 /* DBPDCNT0 */
  78        ED 0xFD000020, 0x015B0002 /* DBCONF */
  79        ED 0xFD000030, 0x03071502 /* DBTR0 */
  80        ED 0xFD000034, 0x02020102 /* DBTR1 */
  81        ED 0xFD000038, 0x01090405 /* DBTR2 */
  82        ED 0xFD00003C, 0x00000002 /* DBTR3 */
  83        ED 0xFD000008, 0x00000005 /* DBKIND */
  84        ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
  85        ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
  86        ED 0xFD000018, 0x00000001 /* DBCKECNT */
  87
  88        mov     #100,r0
  89WAIT_400NS:
  90        dt      r0
  91        bf      WAIT_400NS
  92
  93        ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
  94        ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */
  95        ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */
  96        ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */
  97        ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */
  98        ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
  99        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
 100        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
 101        ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */
 102        ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */
 103        ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */
 104
 105        mov     #100,r0
 106WAIT_400NS_2:
 107        dt      r0
 108        bf      WAIT_400NS_2
 109
 110        ED 0xFD000010, 0x00000001 /* DBEN */
 111        ED 0xFD000044, 0x0000050f /* DBRFPDN1 */
 112        ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */
 113
 114        mov.l   DUMMY,r0
 115        mov.l   @r0, r1 /* force single dummy read */
 116
 117        ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
 118        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
 119        ED 0xFD000108, 0x00000080 /* DBPDCNT0 */
 120        ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
 121
 122        rts
 123         nop
 124
 125        .balign 4
 126DUMMY:  .long   0xac400000
 127FRQCRA: .long   0xa4150000
 128KICK:   .long   0x80000000
 129LSTATS: .long   0xa4150060
 130
 131ENTRY(ms7724se_sdram_leave_end)
 132