board/adder/adder.c

   1 /*
   2  * Copyright (C) 2004-2005 Arabella Software Ltd.
   3  * Yuli Barcohen <yuli@arabellasw.com>
   4  *
   5  * Support for Analogue&Micro Adder boards family.
   6  * Tested on AdderII and Adder87x.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <mpc8xx.h>
  29
  30 /*
  31  * SDRAM is single Samsung K4S643232F-T70   chip (8MB)
  32  *       or single Micron  MT48LC4M32B2TG-7 chip (16MB).
  33  * Minimal CPU frequency is 40MHz.
  34  */
  35 static uint sdram_table[] = {
  36         /* Single read  (offset 0x00 in UPM RAM) */
  37         0x1f07fc24, 0xe0aefc04, 0x10adfc04, 0xe0bbbc00,
  38         0x10f77c44, 0xf3fffc07, 0xfffffc04, 0xfffffc04,
  39
  40         /* Burst read   (offset 0x08 in UPM RAM) */
  41         0x1f07fc24, 0xe0aefc04, 0x10adfc04, 0xf0affc00,
  42         0xf0affc00, 0xf0affc00, 0xf0affc00, 0x10a77c44,
  43         0xf7bffc47, 0xfffffc35, 0xfffffc34, 0xfffffc35,
  44         0xfffffc35, 0x1ff77c35, 0xfffffc34, 0x1fb57c35,
  45
  46         /* Single write (offset 0x18 in UPM RAM) */
  47         0x1f27fc24, 0xe0aebc04, 0x00b93c00, 0x13f77c47,
  48         0xfffdfc04, 0xfffffc04, 0xfffffc04, 0xfffffc04,
  49
  50         /* Burst write  (offset 0x20 in UPM RAM) */
  51         0x1f07fc24, 0xeeaebc00, 0x10ad7c00, 0xf0affc00,
  52         0xf0affc00, 0xe0abbc00, 0x1fb77c47, 0xfffffc04,
  53         0xfffffc04, 0xfffffc04, 0xfffffc04, 0xfffffc04,
  54         0xfffffc04, 0xfffffc04, 0xfffffc04, 0xfffffc04,
  55
  56         /* Refresh      (offset 0x30 in UPM RAM) */
  57         0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
  58         0xfffffc84, 0xfffffc07, 0xfffffc04, 0xfffffc04,
  59         0xfffffc04, 0xfffffc04, 0xfffffc04, 0xfffffc04,
  60
  61         /* Exception    (offset 0x3C in UPM RAM) */
  62         0xfffffc27, 0xfffffc04, 0xfffffc04, 0xfffffc04
  63 };
  64
  65 long int initdram (int board_type)
  66 {
  67         long int msize;
  68         volatile immap_t     *immap  = (volatile immap_t *)CFG_IMMR;
  69         volatile memctl8xx_t *memctl = &immap->im_memctl;
  70
  71         upmconfig(UPMA, sdram_table, sizeof(sdram_table) / sizeof(uint));
  72
  73         /* Configure SDRAM refresh */
  74         memctl->memc_mptpr = MPTPR_PTP_DIV32; /* BRGCLK/32 */
  75
  76         memctl->memc_mamr = (94 << 24) | CFG_MAMR; /* No refresh */
  77         udelay(200);
  78
  79         /* Run precharge from location 0x15 */
  80         memctl->memc_mar = 0x0;
  81         memctl->memc_mcr = 0x80002115;
  82         udelay(200);
  83
  84         /* Run 8 refresh cycles */
  85         memctl->memc_mcr = 0x80002830;
  86         udelay(200);
  87
  88         /* Run MRS pattern from location 0x16 */
  89         memctl->memc_mar = 0x88;
  90         memctl->memc_mcr = 0x80002116;
  91         udelay(200);
  92
  93         memctl->memc_mamr |=  MAMR_PTAE; /* Enable refresh */
  94         memctl->memc_or1   = ~(CFG_SDRAM_MAX_SIZE - 1) | OR_CSNT_SAM;
  95         memctl->memc_br1   =  CFG_SDRAM_BASE | BR_PS_32 | BR_MS_UPMA | BR_V;
  96
  97         msize = get_ram_size(CFG_SDRAM_BASE, CFG_SDRAM_MAX_SIZE);
  98         memctl->memc_or1  |= ~(msize - 1);
  99
 100         return msize;
 101 }
 102
 103 int checkboard( void )
 104 {
 105         puts("Board: Adder");
 106 #if defined(CONFIG_MPC885_FAMILY)
 107         puts("87x\n");
 108 #elif defined(CONFIG_MPC866_FAMILY)
 109         puts("II\n");
 110 #endif
 111
 112         return 0;
 113 }