ivms8.c

嵌入式ARM的一些源代码

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 * Ulrich Lutz, Speech Design GmbH, [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
 */

#include <ppcboot.h>
#include <mpc8xx.h>
#include <commproc.h>

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

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

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

#define	_NOT_USED_	0xFFFFFFFF

/*
 * 50 MHz SHARC access using UPM A
 */
const uint sharc_table[] =
{
	/*
	 * Single Read. (Offset 0 in UPM RAM)
	 */
	0x0FF3FC04, 0x0FF3EC00, 0x7FFFEC04, 0xFFFFEC04,
	0xFFFFEC05, /* last */
	            _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Read. (Offset 8 in UPM RAM)
	 */
	/* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Single Write. (Offset 18 in UPM RAM)
	 */
	0x0FAFFC04, 0x0FAFEC00, 0x7FFFEC04, 0xFFFFEC04,
	0xFFFFEC05, /* last */
	            _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Write. (Offset 20 in UPM RAM)
	 */
	/* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Refresh  (Offset 30 in UPM RAM)
	 */
	/* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Exception. (Offset 3c in UPM RAM)
	 */
	0x7FFFFC07, /* last */
		    _NOT_USED_, _NOT_USED_, _NOT_USED_,
};


/*
 * 50 MHz SDRAM access using UPM B
 */
const uint sdram_table[] =
{
	/*
	 * Single Read. (Offset 0 in UPM RAM)
	 */
	0x0E26FC04, 0x11ADFC04, 0xEFBBBC00, 0x1FF77C45,	/* last */
	_NOT_USED_,
	/*
	 * SDRAM Initialization (offset 5 in UPM 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.
	 *
	 */
		    0x1FF77C35, 0xEFEABC34, 0x1FB57C35, /* last */
	/*
	 * Burst Read. (Offset 8 in UPM RAM)
	 */
	0x0E26FC04, 0x10ADFC04, 0xF0AFFC00, 0xF0AFFC00,
	0xF1AFFC00, 0xEFBBBC00, 0x1FF77C45, /* last */
					    _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Single Write. (Offset 18 in UPM RAM)
	 */
	0x1F27FC04, 0xEEAEBC04, 0x01B93C00, 0x1FF77C45, /* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Write. (Offset 20 in UPM RAM)
	 */
	0x0E26BC00, 0x10AD7C00, 0xF0AFFC00, 0xF0AFFC00,
	0xE1BBBC04, 0x1FF77C45, /* last */
				_NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Refresh  (Offset 30 in UPM RAM)
	 */
	0x1FF5FC84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC84,
	0xFFFFFC05, /* last */
		    _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Exception. (Offset 3c in UPM RAM)
	 */
	0x7FFFFC07, /* last */
		    _NOT_USED_, _NOT_USED_, _NOT_USED_,
};

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


/*
 * Check Board Identity:
 *
 */

int checkboard (void)
{
	printf ("IVMS8\n");
	return (1);
}

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

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

    /* enable SDRAM clock ("switch on" SDRAM */
    immr->im_cpm.cp_pbpar &= ~(CFG_PB_SDRAM_CLKE);	/* GPIO */
    immr->im_cpm.cp_pbodr &= ~(CFG_PB_SDRAM_CLKE);	/* active output */
    immr->im_cpm.cp_pbdir |=   CFG_PB_SDRAM_CLKE ;	/* output */
    immr->im_cpm.cp_pbdat |=   CFG_PB_SDRAM_CLKE ;	/* assert SDRAM CLKE */
    udelay(1);

#if 0
    /*
     * Map controller bank 2 to the SRAM bank at preliminary address.
     */
    memctl->memc_or2 = CFG_OR2;
    memctl->memc_br2 = CFG_BR2;
#endif

    /*
     * Map controller bank 4 to the PER8 bank.
     */
    memctl->memc_or4 = CFG_OR4;
    memctl->memc_br4 = CFG_BR4;

#if 0
    /* Configure SHARC at UMA */
    upmconfig(UPMA, (uint *)sharc_table, sizeof(sharc_table)/sizeof(uint));
    /* Map controller bank 5 to the SHARC */
    memctl->memc_or5 = CFG_OR5;
    memctl->memc_br5 = CFG_BR5;
#endif

    memctl->memc_mamr = 0x00001000;

    /* Configure SDRAM at UMB */
    upmconfig(UPMB, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));

    memctl->memc_mptpr = CFG_MPTPR_1BK_8K;

    memctl->memc_mar = 0x00000088;

    /*
     * Map controller bank 3 to the SDRAM bank at preliminary address.
     */
    memctl->memc_or3 = CFG_OR3_PRELIM;
    memctl->memc_br3 = CFG_BR3_PRELIM;

    memctl->memc_mbmr = CFG_MBMR_8COL;	/* refresh not enabled yet */

    udelay(200);
    memctl->memc_mcr = 0x80806105;
    udelay(1);
    memctl->memc_mcr = 0x80806130;
    udelay(1);
    memctl->memc_mcr = 0x80806130;
    udelay(1);
    memctl->memc_mcr = 0x80806106;

    memctl->memc_mbmr |= MAMR_PTBE;	/* refresh enabled */

    /*
     * Check Bank 0 Memory Size for re-configuration
     */
    size_b0 = dram_size (CFG_MBMR_8COL, (ulong *)SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE);

    memctl->memc_mbmr = CFG_MBMR_8COL | MAMR_PTBE;

    return (size_b0);
}

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

/*
 * 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 mamr_value, long int *base, long int maxsize)
{
    volatile immap_t     *immr  = (immap_t *)CFG_IMMR;
    volatile memctl8xx_t *memctl = &immr->im_memctl;
    volatile long int	 *addr;
    long int		  cnt, val;

    memctl->memc_mbmr = mamr_value;

    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 */
}

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

void	reset_phy(void)
{
	immap_t *immr = (immap_t *)CFG_IMMR;

	/* De-assert Ethernet Powerdown */
	immr->im_cpm.cp_pbpar &= ~(CFG_PB_ETH_POWERDOWN); /* GPIO */
	immr->im_cpm.cp_pbodr &= ~(CFG_PB_ETH_POWERDOWN); /* active output */
	immr->im_cpm.cp_pbdir |=   CFG_PB_ETH_POWERDOWN ; /* output */
	immr->im_cpm.cp_pbdat &= ~(CFG_PB_ETH_POWERDOWN); /* assert SDRAM CLKE */
	udelay(1);

	/*
         * RESET is implemented by a positive pulse of at least 1 us
         * at the reset pin.
	 *
	 * Configure RESET pins for NS DP83843 PHY, and RESET chip.
	 *
	 * Note: The RESET pin is high active, but there is an
	 *	 inverter on the SPD823TS board...
	 */
	immr->im_ioport.iop_pcpar &= ~(CFG_PC_ETH_RESET);
	immr->im_ioport.iop_pcdir |=   CFG_PC_ETH_RESET;
	/* assert RESET signal of PHY */
	immr->im_ioport.iop_pcdat &= ~(CFG_PC_ETH_RESET);
	udelay (10);
	/* de-assert RESET signal of PHY */
	immr->im_ioport.iop_pcdat |=   CFG_PC_ETH_RESET;
	udelay (10);
}