board/guf-neso/lowlevel.c

   1 /*
   2  *
   3  * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23 #include <common.h>
  24 #include <init.h>
  25 #include <mach/imx-regs.h>
  26 #include <mach/imx-pll.h>
  27 #include <mach/esdctl.h>
  28 #include <asm/cache-l2x0.h>
  29 #include <asm/io.h>
  30 #include <mach/imx-nand.h>
  31 #include <asm/barebox-arm.h>
  32 #include <asm/system.h>
  33 #include <asm-generic/memory_layout.h>
  34
  35 static void __bare_init __naked insdram(void)
  36 {
  37         uint32_t r;
  38
  39         PCCR1 |= PCCR1_NFC_BAUDEN;
  40
  41         /* setup a stack to be able to call imx_nand_load_image() */
  42         r = STACK_BASE + STACK_SIZE - 12;
  43         __asm__ __volatile__("mov sp, %0" : : "r"(r));
  44
  45         imx_nand_load_image((void *)TEXT_BASE, 256 * 1024);
  46
  47         board_init_lowlevel_return();
  48 }
  49
  50 #define ESDCTL0_VAL (ESDCTL0_SDE | ESDCTL0_ROW13 | ESDCTL0_COL10)
  51
  52 void __bare_init __naked board_init_lowlevel(void)
  53 {
  54         uint32_t r;
  55         int i;
  56         unsigned int *trg, *src;
  57
  58         /* ahb lite ip interface */
  59         AIPI1_PSR0 = 0x20040304;
  60         AIPI1_PSR1 = 0xDFFBFCFB;
  61         AIPI2_PSR0 = 0x00000000;
  62         AIPI2_PSR1 = 0xFFFFFFFF;
  63
  64         /* Skip SDRAM initialization if we run from RAM */
  65         r = get_pc();
  66         if (r > 0xa0000000 && r < 0xb0000000)
  67                 board_init_lowlevel_return();
  68
  69         /*
  70          * DDR on CSD0
  71          */
  72         writel(0x00000008, ESDMISC); /* Enable DDR SDRAM operation */
  73
  74         DSCR(3) = 0x55555555; /* Set the driving strength   */
  75         DSCR(5) = 0x55555555;
  76         DSCR(6) = 0x55555555;
  77         DSCR(7) = 0x00005005;
  78         DSCR(8) = 0x15555555;
  79
  80         writel(0x00000004, ESDMISC); /* Initial reset */
  81         writel(0x006ac73a, ESDCFG0);
  82
  83         writel(ESDCTL0_VAL | ESDCTL0_SMODE_PRECHARGE, ESDCTL0); /* precharge CSD0 all banks */
  84         writel(0x00000000, 0xA0000F00); /* CSD0 precharge address (A10 = 1) */
  85         writel(ESDCTL0_VAL | ESDCTL0_SMODE_AUTO_REFRESH, ESDCTL0);
  86
  87         for (i = 0; i < 8; i++)
  88                 writel(0, 0xa0000f00);
  89
  90         writel(ESDCTL0_VAL | ESDCTL0_SMODE_LOAD_MODE, ESDCTL0);
  91
  92         writeb(0xda, 0xa0000033);
  93         writeb(0xff, 0xa1000000);
  94         writel(ESDCTL0_VAL | ESDCTL0_DSIZ_31_0 | ESDCTL0_REF4 |
  95                         ESDCTL0_BL | ESDCTL0_SMODE_NORMAL, ESDCTL0);
  96
  97 #ifdef CONFIG_NAND_IMX_BOOT
  98         /* skip NAND boot if not running from NFC space */
  99         r = get_pc();
 100         if (r < IMX_NFC_BASE || r > IMX_NFC_BASE + 0x800)
 101                 board_init_lowlevel_return();
 102
 103         src = (unsigned int *)IMX_NFC_BASE;
 104         trg = (unsigned int *)TEXT_BASE;
 105
 106         /* Move ourselves out of NFC SRAM */
 107         for (i = 0; i < 0x800 / sizeof(int); i++)
 108                 *trg++ = *src++;
 109
 110         /* Jump to SDRAM */
 111         r = (unsigned int)&insdram;
 112         __asm__ __volatile__("mov pc, %0" : : "r"(r));
 113 #else
 114         board_init_lowlevel_return();
 115 #endif
 116 }
 117