nand_spl/board/freescale/mpc8536ds/nand_boot.c

   1 /*
   2  * Copyright 2009 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  *
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  *
  20  */
  21
  22 #include <common.h>
  23 #include <ns16550.h>
  24 #include <asm/io.h>
  25 #include <nand.h>
  26
  27 u32 sysclk_tbl[] = {
  28         33333000, 39999600, 49999500, 66666000,
  29         83332500, 99999000, 133332000, 166665000
  30 };
  31
  32 void board_init_f(ulong bootflag)
  33 {
  34         int px_spd;
  35         u32 plat_ratio, bus_clk, sys_clk;
  36         ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
  37
  38 #if defined(CONFIG_SYS_BR3_PRELIM) && defined(CONFIG_SYS_OR3_PRELIM)
  39         /* for FPGA */
  40         set_lbc_br(3, CONFIG_SYS_BR3_PRELIM);
  41         set_lbc_or(3, CONFIG_SYS_OR3_PRELIM);
  42 #else
  43 #error CONFIG_SYS_BR3_PRELIM, CONFIG_SYS_OR3_PRELIM must be defined
  44 #endif
  45
  46         /* initialize selected port with appropriate baud rate */
  47         px_spd = in_8((unsigned char *)(PIXIS_BASE + PIXIS_SPD));
  48         sys_clk = sysclk_tbl[px_spd & PIXIS_SPD_SYSCLK];
  49         plat_ratio = in_be32(&gur->porpllsr) & MPC85xx_PORPLLSR_PLAT_RATIO;
  50         bus_clk = sys_clk * plat_ratio / 2;
  51
  52         NS16550_init((NS16550_t)CONFIG_SYS_NS16550_COM1,
  53                         bus_clk / 16 / CONFIG_BAUDRATE);
  54
  55         puts("\nNAND boot... ");
  56
  57         /* copy code to RAM and jump to it - this should not return */
  58         /* NOTE - code has to be copied out of NAND buffer before
  59          * other blocks can be read.
  60          */
  61         relocate_code(CONFIG_SYS_NAND_U_BOOT_RELOC_SP, 0,
  62                         CONFIG_SYS_NAND_U_BOOT_RELOC);
  63 }
  64
  65 void board_init_r(gd_t *gd, ulong dest_addr)
  66 {
  67         nand_boot();
  68 }
  69
  70 void putc(char c)
  71 {
  72         if (c == '\n')
  73                 NS16550_putc((NS16550_t)CONFIG_SYS_NS16550_COM1, '\r');
  74
  75         NS16550_putc((NS16550_t)CONFIG_SYS_NS16550_COM1, c);
  76 }
  77
  78 void puts(const char *str)
  79 {
  80         while (*str)
  81                 putc(*str++);
  82 }