mvs1.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 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * Changes for MATRIX Vision MVsensor (C) Copyright 2001
 * MATRIX Vision GmbH / hg, [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>

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

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

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

#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 /*0x1F2DFC04??*/, 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_,
};

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


/*
 * Check Board Identity:
 */

int checkboard (void)
{
	puts ("Board: MATRIX Vision MVsensor\n");
	return 0;
}



#ifdef DO_RAM_TEST
/* ------------------------------------------------------------------------- */

/*
 * Test SDRAM by writing its address to itself and reading several times
*/
#define READ_RUNS 4
static void test_dram (unsigned long *start, unsigned long *end)
{
	unsigned long *addr;
	unsigned long value;
	int read_runs, errors, addr_errors;

	printf ("\nChecking SDRAM from %p to %p\n", start, end);
	udelay (1000000);
	for (addr = start; addr < end; addr++)
		*addr = (unsigned long) addr;

	for (addr = start, addr_errors = 0; addr < end; addr++) {
		for (read_runs = READ_RUNS, errors = 0; read_runs > 0; read_runs--) {
			if ((value = *addr) != (unsigned long) addr)
				errors++;
		}
		if (errors > 0) {
			addr_errors++;
			printf ("SDRAM errors (%d) at %p, last read  = %ld\n",
					errors, addr, value);
			udelay (10000);
		}
	}
	printf ("SDRAM check finished, total errors = %d\n", addr_errors);
}
#endif							/*  DO_RAM_TEST */


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

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, size8, size9;

	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;

#if defined (CFG_OR3_PRELIM) && defined (CFG_BR3_PRELIM)
	if (board_type == 0) {		/* "L" type boards have only one bank SDRAM */
		memctl->memc_or3 = CFG_OR3_PRELIM;
		memctl->memc_br3 = CFG_BR3_PRELIM;
	}
#endif

	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);

	if (board_type == 0) {		/* "L" type boards have only one bank SDRAM */
		memctl->memc_mcr = 0x80006105;	/* SDRAM bank 1 */
		udelay (1);
		memctl->memc_mcr = 0x80006230;	/* SDRAM bank 1 - 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_b0 = size9;
	} else {					/* back to 8 columns            */
		size_b0 = size8;
		memctl->memc_mamr = CFG_MAMR_8COL;
		udelay (500);
	}

	if (board_type == 0) {		/* "L" type boards have only one bank SDRAM */
		/*
		 * Check Bank 1 Memory Size
		 * use current column settings
		 * [9 column SDRAM may also be used in 8 column mode,
		 *  but then only half the real size will be used.]
		 */
#if defined (SDRAM_BASE3_PRELIM)
		size_b1 =
				dram_size (memctl->memc_mamr, (ulong *) SDRAM_BASE3_PRELIM,
						   SDRAM_MAX_SIZE);
#else
		size_b1 = 0;
#endif
	} else {
		size_b1 = 0;
	}

	udelay (1000);

	/*
	 * Adjust refresh rate depending on SDRAM type, both banks
	 * For types > 128 MBit leave it at the current (fast) rate
	 */
	if ((size_b0 < 0x02000000) && (size_b1 < 0x02000000)) {
		/* reduce to 15.6 us (62.4 us / quad) */
		memctl->memc_mptpr = CFG_MPTPR_2BK_4K;
		udelay (1000);
	}

	/*
	 * Final mapping: map bigger bank first
	 */
	if (size_b1 > size_b0) {	/* SDRAM Bank 1 is bigger - map first   */

		memctl->memc_or3 = ((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
		memctl->memc_br3 =
				(CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;

		if (size_b0 > 0) {
			/*
			 * Position Bank 0 immediately above Bank 1
			 */
			memctl->memc_or2 =
					((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
			memctl->memc_br2 =
					((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V)
					+ size_b1;
		} else {
			unsigned long reg;

			/*
			 * No bank 0
			 *
			 * invalidate bank
			 */
			memctl->memc_br2 = 0;

			/* 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;
		}

	} else {					/* SDRAM Bank 0 is bigger - map first   */

		memctl->memc_or2 = ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
		memctl->memc_br2 =
				(CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;

		if (size_b1 > 0) {
			/*
			 * Position Bank 1 immediately above Bank 0
			 */
			memctl->memc_or3 =
					((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
			memctl->memc_br3 =
					((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V)
					+ size_b0;
		} else {
			unsigned long reg;

			/*
			 * No bank 1
			 *
			 * invalidate bank
			 */
			memctl->memc_br3 = 0;

			/* 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;
		}
	}

	udelay (10000);

#ifdef DO_RAM_TEST
	if (size_b0 > 0)
		test_dram ((unsigned long *) CFG_SDRAM_BASE,
				   (unsigned long *) (CFG_SDRAM_BASE + size_b0));
#endif

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


	memctl->memc_mamr = 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 */
}


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

u8 *dhcp_vendorex_prep (u8 * e)
{
	char *ptr;

/* DHCP vendor-class-identifier = 60 */
	if ((ptr = getenv ("dhcp_vendor-class-identifier"))) {
		*e++ = 60;
		*e++ = strlen (ptr);
		while (*ptr)
			*e++ = *ptr++;
	}
/* my DHCP_CLIENT_IDENTIFIER = 61 */
	if ((ptr = getenv ("dhcp_client_id"))) {
		*e++ = 61;
		*e++ = strlen (ptr);
		while (*ptr)
			*e++ = *ptr++;
	}

	return e;
}


/* ------------------------------------------------------------------------- */
u8 *dhcp_vendorex_proc (u8 * popt)
{
	return NULL;
}