esteem192e.c

U BOOT源码

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 *
 * Modified By Conn Clark to work with Esteem 192E 7/31/00
 *
 */

#include <common.h>
#include <mpc8xx.h>

/* ------------------------------------------------------------------------- */

static long int dram_size ( long int *base, long int maxsize);

/* ------------------------------------------------------------------------- */

#define	_NOT_USED_	0xFFFFFFFF

const uint sdram_table[] =
{
	/*
	 * Single Read. (Offset 0 in UPMA RAM)
	 *
	 * active, NOP, read, precharge, NOP */
	0x0F27CC04, 0x0EAECC04, 0x00B98C04, 0x00F74C00,
	0x11FFCC05, /* last */
	/*
	 * SDRAM Initialization (offset 5 in UPMA RAM)
	 *
	 * This is no UPM entry point. The following definition uses
	 * the remaining space to establish an initialization
	 * sequence, which is executed by a RUN command.
	 * NOP, Program
	 */
	0x0F0A8C34, 0x1F354C37, /* last */

	_NOT_USED_,  /* Not used */

	/*
	 * Burst Read. (Offset 8 in UPMA RAM)
	 * active, NOP, read, NOP, NOP, NOP, NOP, NOP */
	0x0F37CC04, 0x0EFECC04, 0x00FDCC04, 0x00FFCC00,
	0x00FFCC00, 0x01FFCC00, 0x0FFFCC00, 0x1FFFCC05, /* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Single Write. (Offset 18 in UPMA RAM)
	 * active, NOP, write, NOP, precharge, NOP */
	0x0F27CC04, 0x0EAE8C00, 0x01BD4C04, 0x0FFB8C04,
	0x0FF74C04, 0x1FFFCC05, /* last */
	_NOT_USED_, _NOT_USED_,
	/*
	 * Burst Write. (Offset 20 in UPMA RAM)
	 * active, NOP, write, NOP, NOP, NOP, NOP, NOP */
	0x0F37CC04, 0x0EFE8C00, 0x00FD4C00, 0x00FFCC00,
	0x00FFCC00, 0x01FFCC04, 0x0FFFCC04, 0x1FFFCC05, /* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Refresh  (Offset 30 in UPMA RAM)
	 * precharge, NOP, auto_ref, NOP, NOP, NOP */
	0x0FF74C34, 0x0FFACCB4, 0x0FF5CC34, 0x0FFFCC34,
	0x0FFFCCB4, 0x1FFFCC35, /* last */
				_NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Exception. (Offset 3c in UPMA RAM)
	 */
	0x0FFB8C00, 0x1FF74C03, /* last */
				_NOT_USED_, _NOT_USED_
};

/* ------------------------------------------------------------------------- */


/*
 * Check Board Identity:
 */

int checkboard (void)
{
    puts ("Board: Esteem 192E\n");
    return(0);
}

/* ------------------------------------------------------------------------- */


long int initdram (int board_type)
{
    volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
    volatile memctl8xx_t *memctl = &immap->im_memctl;
    long int size_b0, size_b1;

    /*
     * Explain frequency of refresh here
     */

    memctl->memc_mptpr = 0x0200; /* divide by 32 */

    memctl->memc_mamr = 0x18003112; /*CFG_MAMR_8COL;*/ /* 0x18005112 TODO: explain here */

    upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));

    /*
     * Map cs 2 and 3 to the SDRAM banks 0 and 1 at
     * preliminary addresses - these have to be modified after the
     * SDRAM size has been determined.
     */

    memctl->memc_or2 = CFG_OR2_PRELIM; /* not defined yet */
    memctl->memc_br2 = CFG_BR2_PRELIM;

    memctl->memc_or3 = CFG_OR3_PRELIM;
    memctl->memc_br3 = CFG_BR3_PRELIM;


    /* perform SDRAM initializsation sequence */
    memctl->memc_mar  = 0x00000088;

    memctl->memc_mcr  = 0x80004830;	/* SDRAM bank 0 execute 8 refresh */

    memctl->memc_mcr  = 0x80004105; 	/* SDRAM bank 0 */


    memctl->memc_mcr  = 0x80006830;	/* SDRAM bank 1 execute 8 refresh */

    memctl->memc_mcr  = 0x80006105;	/* SDRAM bank 1 */


    memctl->memc_mamr = CFG_MAMR_8COL; /* 0x18803112  start refresh timer TODO: explain here */

/* printf ("banks 0 and 1 are programed\n"); */

    /*
     * Check Bank 0 Memory Size for re-configuration
     *
     */

    size_b0 = dram_size ((ulong *)SDRAM_BASE2_PRELIM, SDRAM_MAX_SIZE);

    size_b1 = dram_size ((ulong *)SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE);


 printf ("\nbank 0 size %lu\nbank 1 size %lu\n",size_b0,size_b1);


/* printf ("bank 1 size %u\n",size_b1); */

    if(size_b1 == 0) {

    /*
     * Adjust refresh rate if bank 0 isn't stuffed
     */

       memctl->memc_mptpr = 0x0400; /* divide by 64 */
       memctl->memc_br3 &= 0x0FFFFFFFE;

    /*
     * Adjust OR2 for size of bank 0
     */
       memctl->memc_or2 |= 7 * size_b0;

    }

    else {

       if(size_b0 < size_b1) {
	  memctl->memc_br2 &= 0x00007FFE;
	  memctl->memc_br3 &= 0x00007FFF;

	 /*
	  * Adjust OR3 for size of bank 1
	  */
	  memctl->memc_or3 |= 15 * size_b1;

	 /*
	  * Adjust OR2 for size of bank 0
	  */
	  memctl->memc_or2 |= 15 * size_b0;

	  memctl->memc_br2 += (size_b1 + 1);

       }
       else {

	  memctl->memc_br3 &= 0x00007FFE;


	 /*
	  * Adjust OR2 for size of bank 0
	  */
	  memctl->memc_or2 |= 15 * size_b0;

	 /*
	  * Adjust OR3 for size of bank 1
	  */
	  memctl->memc_or3 |= 15 * size_b1;

	  memctl->memc_br3 += (size_b0 + 1);


       }
    }


/* before leaving set all unused i/o pins to outputs */

/*
 *      --*Unused Pin List*--
 *
 * group/port           bit number
 * IP_B                 0,1,3,4,5  Taken care of in pcmcia-cs-x.x.xx
 * PA                   5,7,8,9,14,15
 * PB                   22,23,31
 * PC                   4,5,6,7,10,11,12,13,14,15
 * PD                   5,6,7
 *
 */

/*
 *   --*Pin Used for I/O List*--
 *
 * port     input bit number    output bit number    either
 * PB                           18,26,27
 * PD       3,4                                      8,9,10,11,12,13,14,15
 *
 */


    immap->im_ioport.iop_papar &= ~0x05C3;    /* set pins as io */
    immap->im_ioport.iop_padir |= 0x05C3;     /* set pins as output */
    immap->im_ioport.iop_paodr &= 0x0008;     /* config pins 9 & 14 as normal outputs */
    immap->im_ioport.iop_padat |= 0x05C3;     /* set unused pins as high */

    immap->im_cpm.cp_pbpar &= ~0x00001331; /* set unused port b pins as io */
    immap->im_cpm.cp_pbdir |= 0x00001331;  /* set unused port b pins as output */
    immap->im_cpm.cp_pbodr &= ~0x00001331; /* config bits 18,22,23,26,27 & 31 as normal outputs */
    immap->im_cpm.cp_pbdat |= 0x00001331;  /* set T/E LED, /NV_CS, & /POWER_ADJ_CS and the rest to a high */

    immap->im_ioport.iop_pcpar &= ~0x0F3F;    /* set unused port c pins as io */
    immap->im_ioport.iop_pcdir |= 0x0F3F;     /* set unused port c pins as output */
    immap->im_ioport.iop_pcso  &= ~0x0F3F;    /* clear special purpose bit for unused port c pins for clarity */
    immap->im_ioport.iop_pcdat |= 0x0F3F;     /* set unused port c pins high*/

    immap->im_ioport.iop_pdpar &= 0xE000;     /* set pins as io */
    immap->im_ioport.iop_pddir &= 0xE000;     /* set bit 3 & 4 as inputs */
    immap->im_ioport.iop_pddir |= 0x07FF;     /* set bits 5 - 15 as outputs */
    immap->im_ioport.iop_pddat = 0x0055;      /* set alternating pattern on test port */


    return (size_b0 + size_b1);
}

/* ------------------------------------------------------------------------- */

/*
 * Check memory range for valid RAM. A simple memory test determines
 * the actually available RAM size between addresses `base' and
 * `base + maxsize'. Some (not all) hardware errors are detected:
 * - short between address lines
 * - short between data lines
 */

static long int dram_size ( long int *base, long int maxsize)
{

    volatile long int	 *addr;
    long int		  cnt, val;

    for (cnt = maxsize/sizeof(long); cnt > 0; cnt >>= 1) {
	addr = base + cnt;	/* pointer arith! */

	*addr = ~cnt;
    }

    /* write 0 to base address */
    addr = base;
    *addr = 0;

    /* check at base address */
    if ((val = *addr) != 0) {
	return (0);
    }

    for (cnt = 1; ; cnt <<= 1) {
	addr = base + cnt;	/* pointer arith! */

	val = *addr;

	if (val != (~cnt)) {
	    return (cnt * sizeof(long));
	}
    }
    /* NOTREACHED */
}