pcu_e.c

AT91RM9200的完整启动代码：包括loader, boot及U-boot三部分均已编译通过！欢迎下载使用！

/*
 * (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 <common.h>
#include <mpc8xx.h>
#include <commproc.h>
#include <i2c.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);

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

#define	_NOT_USED_	0xFFFFFFFF

/*
 * 50 MHz SDRAM access using UPM A
 */
const uint sdram_table[] =
{
	/*
	 * Single Read. (Offset 0 in UPM RAM)
	 */
	0x1f0dfc04, 0xeeafbc04, 0x11af7c04, 0xefbeec00,
	0x1ffddc47, /* last */
	/*
	 * 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.
	 *
	 */
		    0x1ffddc35, 0xefceac34, 0x1f3d5c35, /* last */
	/*
	 * Burst Read. (Offset 8 in UPM RAM)
	 */
	0x1f0dfc04, 0xeeafbc04, 0x10af7c04, 0xf0affc00,
	0xf0affc00, 0xf1affc00, 0xefbeec00, 0x1ffddc47, /* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/*
	 * Single Write. (Offset 18 in UPM RAM)
	 */
	0x1f0dfc04, 0xeeafac00, 0x01be4c04, 0x1ffddc47, /* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Write. (Offset 20 in UPM RAM)
	 */
	0x1f0dfc04, 0xeeafac00, 0x10af5c00, 0xf0affc00,
	0xf0affc00, 0xe1beec04, 0x1ffddc47, /* last */
					    _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Refresh  (Offset 30 in UPM RAM)
	 */
	0x1ffd7c84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
	0xfffffc84, 0xfffffc07, /* last */
				_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_,
};

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

/*
 * 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)
	 */
	0x0ffff804, 0x0ffff400, 0x3ffffc47, /* 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:
 *
 */

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

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

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, reg;
    int i;

    /*
     * Configure UPMA for SDRAM
     */
    upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));

    memctl->memc_mptpr = CFG_MPTPR;

    /* burst length=4, burst type=sequential, CAS latency=2 */
    memctl->memc_mar = 0x00000088;

    /*
     * Map controller bank 2 to the SDRAM bank at preliminary address.
     */
#if PCU_E_WITH_SWAPPED_CS	/* XXX */
    memctl->memc_or5 = CFG_OR5_PRELIM;
    memctl->memc_br5 = CFG_BR5_PRELIM;
#else	/* XXX */
    memctl->memc_or2 = CFG_OR2_PRELIM;
    memctl->memc_br2 = CFG_BR2_PRELIM;
#endif	/* XXX */

    /* initialize memory address register */
    memctl->memc_mamr = CFG_MAMR;	/* refresh not enabled yet */

    /* mode initialization (offset 5) */
#if PCU_E_WITH_SWAPPED_CS	/* XXX */
    udelay(200);	/* 0x8000A105 */
    memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS5 | MCR_MLCF(1) | MCR_MAD(0x05);
#else	/* XXX */
    udelay(200);	/* 0x80004105 */
    memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS2 | MCR_MLCF(1) | MCR_MAD(0x05);
#endif	/* XXX */

    /* run 2 refresh sequence with 4-beat refresh burst (offset 0x30) */
#if PCU_E_WITH_SWAPPED_CS	/* XXX */
    udelay(1);		/* 0x8000A830 */
    memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS5 | MCR_MLCF(8) | MCR_MAD(0x30);
#else	/* XXX */
    udelay(1);		/* 0x80004830 */
    memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS2 | MCR_MLCF(8) | MCR_MAD(0x30);
#endif	/* XXX */

#if PCU_E_WITH_SWAPPED_CS	/* XXX */
    udelay(1);		/* 0x8000A106 */
    memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS5 | MCR_MLCF(1) | MCR_MAD(0x06);
#else	/* XXX */
    udelay(1);		/* 0x80004106 */
    memctl->memc_mcr = MCR_OP_RUN | MCR_MB_CS2 | MCR_MLCF(1) | MCR_MAD(0x06);
#endif	/* XXX */

    reg  =  memctl->memc_mamr;
    reg &= ~MAMR_TLFB_MSK;		/* switch timer loop ... */
    reg |=  MAMR_TLFB_4X;		/* ... to 4x */
    reg |=  MAMR_PTBE;			/* enable refresh */
    memctl->memc_mamr = reg;

    udelay(200);

    /* Need at least 10 DRAM accesses to stabilize */
    for (i=0; i<10; ++i) {
#if PCU_E_WITH_SWAPPED_CS	/* XXX */
	volatile unsigned long *addr = (volatile unsigned long *)SDRAM_BASE5_PRELIM;
#else	/* XXX */
	volatile unsigned long *addr = (volatile unsigned long *)SDRAM_BASE2_PRELIM;
#endif	/* XXX */
	unsigned long val;

	val = *(addr + i);
	*(addr + i) = val;
    }

    /*
     * Check Bank 0 Memory Size for re-configuration
     */
#if PCU_E_WITH_SWAPPED_CS	/* XXX */
    size_b0 = dram_size (CFG_MAMR, (ulong *)SDRAM_BASE5_PRELIM, SDRAM_MAX_SIZE);
#else	/* XXX */
    size_b0 = dram_size (CFG_MAMR, (ulong *)SDRAM_BASE2_PRELIM, SDRAM_MAX_SIZE);
#endif	/* XXX */

    memctl->memc_mamr = CFG_MAMR | MAMR_PTBE;

    /*
     * Final mapping:
     */

#if PCU_E_WITH_SWAPPED_CS	/* XXX */
    memctl->memc_or5 = ((-size_b0) & 0xFFFF0000) | SDRAM_TIMING;
    memctl->memc_br5 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
#else	/* XXX */
    memctl->memc_or2 = ((-size_b0) & 0xFFFF0000) | SDRAM_TIMING;
    memctl->memc_br2 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
#endif	/* XXX */
    udelay(1000);

    /*
     * Configure UPMB for PUMA
     */
    upmconfig(UPMB, (uint *)puma_table, sizeof(puma_table)/sizeof(uint));

    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;
    ulong		  cnt, val;
    ulong		  save[32];	/* to make test non-destructive */
    unsigned char	  i = 0;

    memctl->memc_mamr = mamr_value;

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