board/mx1ads/lowlevel_init.S

   1 /*
   2  * board/mx1ads/lowlevel_init.S
   3  *
   4  * (c) Copyright 2004
   5  * Techware Information Technology, Inc.
   6  * http://www.techware.com.tw/
   7  *
   8  * Ming-Len Wu <minglen_wu@techware.com.tw>
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 #include <config.h>
  14 #include <version.h>
  15
  16 #define SDCTL0                  0x221000
  17 #define SDCTL1                  0x221004
  18
  19
  20 _TEXT_BASE:
  21         .word   CONFIG_SYS_TEXT_BASE
  22
  23 .globl lowlevel_init
  24 lowlevel_init:
  25 /* memory controller init               */
  26
  27         ldr  r1, =SDCTL0
  28
  29 /*  Set Precharge Command               */
  30
  31         ldr  r3, =0x92120200
  32 /*      ldr  r3, =0x92120251
  33 */
  34         str  r3, [r1]
  35
  36 /* Issue Precharge All Commad           */
  37         ldr  r3, =0x8200000
  38         ldr  r2, [r3]
  39
  40 /* Set AutoRefresh Command              */
  41         ldr  r3, =0xA2120200
  42         str  r3, [r1]
  43
  44 /* Issue AutoRefresh Command            */
  45         ldr  r3, =0x8000000
  46         ldr  r2, [r3]
  47         ldr  r2, [r3]
  48         ldr  r2, [r3]
  49         ldr  r2, [r3]
  50         ldr  r2, [r3]
  51         ldr  r2, [r3]
  52         ldr  r2, [r3]
  53         ldr  r2, [r3]
  54
  55 /* Set Mode Register                    */
  56         ldr  r3, =0xB2120200
  57         str  r3, [r1]
  58
  59 /* Issue Mode Register Command          */
  60         ldr  r3, =0x08111800    /* Mode Register Value          */
  61         ldr  r2, [r3]
  62
  63 /* Set Normal Mode                      */
  64         ldr  r3, =0x82124200
  65         str  r3, [r1]
  66
  67 /* everything is fine now               */
  68         mov     pc, lr