board/mx31ads/mx31ads.c

   1 /*
   2  * Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include <common.h>
  24 #include <asm/io.h>
  25 #include <asm/arch/mx31.h>
  26 #include <asm/arch/mx31-regs.h>
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 int dram_init(void)
  31 {
  32         gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
  33         gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
  34
  35         return 0;
  36 }
  37
  38 int board_init(void)
  39 {
  40         int i;
  41 #if 0
  42         /* CS0: Nor Flash */
  43         /*
  44          * These are values from the RedBoot sources by Freescale. However,
  45          * under U-Boot with this configuration 32-bit accesses don't work,
  46          * lower 16 bits of data are read twice for each 32-bit read.
  47          */
  48         __REG(CSCR_U(0)) = 0x23524E80;
  49         __REG(CSCR_L(0)) = 0x10000D03; /* WRAP bit (1) is suspicious here, but
  50                                         * disabling it doesn't help either */
  51         __REG(CSCR_A(0)) = 0x00720900;
  52 #endif
  53
  54         /* setup pins for UART1 */
  55         mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);
  56         mx31_gpio_mux(MUX_TXD1__UART1_TXD_MUX);
  57         mx31_gpio_mux(MUX_RTS1__UART1_RTS_B);
  58         mx31_gpio_mux(MUX_RTS1__UART1_CTS_B);
  59
  60         /* PBC setup */
  61         /* Enable UART transceivers also reset the Ethernet/external UART */
  62         readw(CS4_BASE + 4);
  63
  64         writew(0x8023, CS4_BASE + 4);
  65
  66         /* RedBoot also has an empty loop with 100000 iterations here -
  67          * clock doesn't run yet */
  68         for (i = 0; i < 100000; i++)
  69                 ;
  70
  71         /* Clear the reset, toggle the LEDs */
  72         writew(0xDF, CS4_BASE + 6);
  73
  74         /* clock still doesn't run */
  75         for (i = 0; i < 100000; i++)
  76                 ;
  77
  78         /* See 1.5.4 in IMX31ADSE_PERI_BUS_CNTRL_CPLD_RM.pdf */
  79         readb(CS4_BASE + 8);
  80         readb(CS4_BASE + 7);
  81         readb(CS4_BASE + 8);
  82         readb(CS4_BASE + 7);
  83
  84         gd->bd->bi_arch_number = 447;           /* board id for linux */
  85         gd->bd->bi_boot_params = 0x80000100;    /* adress of boot parameters */
  86
  87         return 0;
  88 }
  89
  90 int checkboard(void)
  91 {
  92         printf("Board: MX31ADS\n");
  93         return 0;
  94 }