ccm.c

嵌入式linux的bsp

/*
 * (C) Copyright 2001
 * 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
 */

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

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

static long int dram_size (long int, long int *, long int);
static void puma_status (void);
static void puma_set_mode (int mode);
static int  puma_init_done (void);
static void puma_load (ulong addr, ulong len);
static void can_driver_enable (void);
static void can_driver_disable (void);

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

#define	_NOT_USED_	0xFFFFFFFF

const uint sdram_table[] =
{
	/*
	 * Single Read. (Offset 0 in UPMA RAM)
	 */
	0x1F0DFC04, 0xEEAFBC04, 0x11AF7C04, 0xEFBAFC00,
	0x1FF5FC47, /* 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.
	 *
	 */
		    0x1FF5FC34, 0xEFEABC34, 0x1FB57C35, /* last */
	/*
	 * Burst Read. (Offset 8 in UPMA RAM)
	 */
	0x1F0DFC04, 0xEEAFBC04, 0x10AF7C04, 0xF0AFFC00,
	0xF0AFFC00, 0xF1AFFC00, 0xEFBAFC00, 0x1FF5FC47, /* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Single Write. (Offset 18 in UPMA RAM)
	 */
	0x1F0DFC04, 0xEEABBC00, 0x01B27C04, 0x1FF5FC47, /* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Write. (Offset 20 in UPMA RAM)
	 */
	0x1F0DFC04, 0xEEABBC00, 0x10A77C00, 0xF0AFFC00,
	0xF0AFFC00, 0xE1BAFC04, 0x1FF5FC47, /* last */
					    _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Refresh  (Offset 30 in UPMA RAM)
	 */
	0x1FFD7C84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC04,
	0xFFFFFC84, 0xFFFFFC07, /* last */
				_NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Exception. (Offset 3c in UPMA RAM)
	 */
	0x7FFFFC07, /* last */
		    _NOT_USED_, _NOT_USED_, _NOT_USED_,
};

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

/*
 * PUMA access using UPM B
 */
const uint puma_table[] =
{
	/*
	 * Single Read. (Offset 0 in UPM RAM)
	 */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_,
	/*
	 * Precharge and MRS
	 */
		    _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Read. (Offset 8 in UPM RAM)
	 */
	_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)
	 */
	0x0FFCF804, 0x0FFCF400, 0x3FFDFC47, /* last */
					    _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Write. (Offset 20 in UPM RAM)
	 */
	_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)
	 */
	_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_,
};

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


/*
 * Check Board Identity:
 *
 * Always return 1 (no second DRAM bank since based on TQM8xxL module)
 */

int checkboard (void)
{
    unsigned char *s;
    unsigned char buf[64];
    
    s = (getenv_r ("serial#", buf, sizeof(buf)) > 0) ? buf : NULL;

    puts ("Siemens CCM");

    if (s) {
	    puts (" (");

	    for (; *s; ++s) {
		if (*s == ' ')
		    break;
		putc (*s);
	    }
	    putc (')');
    }

    putc ('\n');

    return (1);
}

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

long int initdram (int board_type)
{
    volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
    volatile memctl8xx_t *memctl = &immap->im_memctl;
    long int size8, size9;
    long int size = 0;
    unsigned long reg;

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

    /*
     * Preliminary prescaler for refresh (depends on number of
     * banks): This value is selected for four cycles every 62.4 us
     * with two SDRAM banks or four cycles every 31.2 us with one
     * bank. It will be adjusted after memory sizing.
     */
    memctl->memc_mptpr = CFG_MPTPR_2BK_8K;

    memctl->memc_mar  = 0x00000088;

    /*
     * Map controller banks 2 and 3 to the SDRAM banks 2 and 3 at
     * preliminary addresses - these have to be modified after the
     * SDRAM size has been determined.
     */
    memctl->memc_or2 = CFG_OR2_PRELIM;
    memctl->memc_br2 = CFG_BR2_PRELIM;

    memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE)); /* no refresh yet */

    udelay(200);

    /* perform SDRAM initializsation sequence */

    memctl->memc_mcr  = 0x80004105;	/* SDRAM bank 0 */
    udelay(1);
    memctl->memc_mcr  = 0x80004230;	/* SDRAM bank 0 - execute twice */
    udelay(1);

    memctl->memc_mamr |= MAMR_PTAE;	/* enable refresh */

    udelay (1000);

    /*
     * Check Bank 0 Memory Size for re-configuration
     *
     * try 8 column mode
     */
    size8 = dram_size (CFG_MAMR_8COL, (ulong *)SDRAM_BASE2_PRELIM, SDRAM_MAX_SIZE);

    udelay (1000);

    /*
     * try 9 column mode
     */
    size9 = dram_size (CFG_MAMR_9COL, (ulong *)SDRAM_BASE2_PRELIM, SDRAM_MAX_SIZE);

    if (size8 < size9) {		/* leave configuration at 9 columns	*/
	size = size9;
/*	debug ("SDRAM in 9 column mode: %ld MB\n", size >> 20);	*/
    } else {				/* back to 8 columns			*/
	size = size8;
	memctl->memc_mamr = CFG_MAMR_8COL;
	udelay(500);
/*	debug ("SDRAM in 8 column mode: %ld MB\n", size >> 20);	*/
    }

    udelay (1000);

    /*
     * Adjust refresh rate depending on SDRAM type
     * For types > 128 MBit leave it at the current (fast) rate
     */
    if (size < 0x02000000) {
	/* reduce to 15.6 us (62.4 us / quad) */
	memctl->memc_mptpr = CFG_MPTPR_2BK_4K;
	udelay(1000);
    }

    /*
     * Final mapping
     */

    memctl->memc_or2 = ((-size) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
    memctl->memc_br2 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;


    /* adjust refresh rate depending on SDRAM type, one bank */
    reg = memctl->memc_mptpr;
    reg >>= 1;	/* reduce to CFG_MPTPR_1BK_8K / _4K */
    memctl->memc_mptpr = reg;

    can_driver_enable ();

    udelay(10000);

    return (size);
}

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

/*
 * Warning - both the PUMA load mode and the CAN driver use UPM B,
 * so make sure only one of both is active.
 */
static void can_driver_enable (void)
{
    volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
    volatile memctl8xx_t *memctl = &immap->im_memctl;

    /* Initialize MBMR */
    memctl->memc_mbmr = MAMR_GPL_B4DIS;	/* GPL_B4 ouput line Disable */

    /* Initialize UPMB for CAN: single read */
    memctl->memc_mdr = 0xFFFFC004;
    memctl->memc_mcr = 0x0100 | UPMB;

    memctl->memc_mdr = 0x0FFFD004;
    memctl->memc_mcr = 0x0101 | UPMB;

    memctl->memc_mdr = 0x0FFFC000;
    memctl->memc_mcr = 0x0102 | UPMB;

    memctl->memc_mdr = 0x3FFFC004;
    memctl->memc_mcr = 0x0103 | UPMB;

    memctl->memc_mdr = 0xFFFFDC05;
    memctl->memc_mcr = 0x0104 | UPMB;

    /* Initialize UPMB for CAN: single write */
    memctl->memc_mdr = 0xFFFCC004;
    memctl->memc_mcr = 0x0118 | UPMB;

    memctl->memc_mdr = 0xCFFCD004;
    memctl->memc_mcr = 0x0119 | UPMB;

    memctl->memc_mdr = 0x0FFCC000;
    memctl->memc_mcr = 0x011A | UPMB;

    memctl->memc_mdr = 0x7FFCC004;
    memctl->memc_mcr = 0x011B | UPMB;