flash.c

嵌入式ARM的一些源代码

/*
 * (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
 */

#include <ppcboot.h>

flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info);

int flash_write (uchar *, ulong, ulong);
flash_info_t *addr2info (ulong);

static int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt);
static int write_word (flash_info_t *info, ulong dest, ulong data);
static void flash_get_offsets (ulong base, flash_info_t *info);
static int  flash_protect (int flag, ulong from, ulong to, flash_info_t *info);

/*-----------------------------------------------------------------------
 * Protection Flags:
 */
#define FLAG_PROTECT_SET	0x01
#define FLAG_PROTECT_CLEAR	0x02


#ifdef CONFIG_ADCIOP
#define ADDR0           0x0aa9
#define ADDR1           0x0556
#define FLASH_WORD_SIZE unsigned char
#endif

#ifdef CONFIG_CPCI405
#define ADDR0           0x5555
#define ADDR1           0x2aaa
#define FLASH_WORD_SIZE unsigned short
#endif

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

unsigned long flash_init (void)
{
	unsigned long size_b0, size_b1;
	int i;

	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

#ifdef CONFIG_CPCI405  /* test-only: no flash yet!!! */
        flash_info[0].flash_id	= FLASH_UNKNOWN;
        flash_info[1].flash_id	= FLASH_UNKNOWN;
        flash_info[0].sector_count	= -1;
        flash_info[1].sector_count	= -1;
        flash_info[0].size		= 0;
        flash_info[1].size		= 0;
        return 1;
#endif  /* test-only: no flash yet!!! */

	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
			size_b0, size_b0<<20);
	}

	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);

	if (size_b1 > size_b0) {
		printf ("## ERROR: "
			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
			size_b1, size_b1<<20,
			size_b0, size_b0<<20
		);
		flash_info[0].flash_id	= FLASH_UNKNOWN;
		flash_info[1].flash_id	= FLASH_UNKNOWN;
		flash_info[0].sector_count	= -1;
		flash_info[1].sector_count	= -1;
		flash_info[0].size		= 0;
		flash_info[1].size		= 0;
		return (0);
	}

#if 0 /* test-only: uncomment for sdram images */
	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);

	/* monitor protection ON by default */
	(void)flash_protect(FLAG_PROTECT_SET,
			    CFG_FLASH_BASE,
			    CFG_FLASH_BASE+CFG_MONITOR_LEN-1,
			    &flash_info[0]);

	if (size_b1) {
		memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
				    BR_MS_GPCM | BR_V;

		/* Re-do sizing to get full correct info */
		size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
					  &flash_info[1]);

		flash_get_offsets (CFG_FLASH_BASE + size_b0, &flash_info[1]);

		/* monitor protection ON by default */
		(void)flash_protect(FLAG_PROTECT_SET,
				    CFG_FLASH_BASE,
				    CFG_FLASH_BASE+CFG_MONITOR_LEN-1,
				    &flash_info[1]);
	} else {
		flash_info[1].flash_id = FLASH_UNKNOWN;
		flash_info[1].sector_count = -1;
	}
#else
	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);

	flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);

	/* monitor protection ON by default */
	(void)flash_protect(FLAG_PROTECT_SET,
			    FLASH_BASE0_PRELIM+size_b0-CFG_MONITOR_LEN,
			    FLASH_BASE0_PRELIM+size_b0-1,
			    &flash_info[0]);

	if (size_b1) {
		/* Re-do sizing to get full correct info */
		size_b1 = flash_get_size((vu_long *)(FLASH_BASE0_PRELIM + size_b0),
					  &flash_info[1]);

		flash_get_offsets (FLASH_BASE0_PRELIM + size_b0, &flash_info[1]);

		/* monitor protection ON by default */
		(void)flash_protect(FLAG_PROTECT_SET,
				    FLASH_BASE0_PRELIM+size_b0+size_b1-CFG_MONITOR_LEN,
				    FLASH_BASE0_PRELIM+size_b0+size_b1-1,
				    &flash_info[1]);
                /* monitor protection OFF by default (one is enough) */
                (void)flash_protect(FLAG_PROTECT_CLEAR,
                                    FLASH_BASE0_PRELIM+size_b0-CFG_MONITOR_LEN,
                                    FLASH_BASE0_PRELIM+size_b0-1,
                                    &flash_info[0]);
	} else {
		flash_info[1].flash_id = FLASH_UNKNOWN;
		flash_info[1].sector_count = -1;
	}
#endif

	flash_info[0].size = size_b0;
	flash_info[1].size = size_b1;

	return (size_b0 + size_b1);
}

/*-----------------------------------------------------------------------
 * Check or set protection status for monitor sectors
 *
 * The monitor always occupies the _first_ part of the _first_ Flash bank.
 */
static int  flash_protect (int flag, ulong from, ulong to, flash_info_t *info)
{
	ulong b_end = info->start[0] + info->size - 1;	/* bank end address */
	int rc    =  0;
	int first = -1;
	int last  = -1;
	int i;

	if (to < info->start[0]) {
		return (0);
	}

	for (i=0; i<info->sector_count; ++i) {
		ulong end;		/* last address in current sect	*/
		short s_end;

		s_end = info->sector_count - 1;

		end = (i == s_end) ? b_end : info->start[i + 1] - 1;

		if (from > end) {
			continue;
		}
		if (to < info->start[i]) {
			continue;
		}

		if (from == info->start[i]) {
			first = i;
			if (last < 0) {
				last = s_end;
			}
		}
		if (to  == end) {
			last  = i;
			if (first < 0) {
				first = 0;
			}
		}
	}

	for (i=first; i<=last; ++i) {
		if (flag & FLAG_PROTECT_CLEAR) {
			info->protect[i] = 0;
		} else if (flag & FLAG_PROTECT_SET) {
			info->protect[i] = 1;
		}
		if (info->protect[i]) {
			rc = 1;
		}
	}
	return (rc);
}


/*-----------------------------------------------------------------------
 */
static void flash_get_offsets (ulong base, flash_info_t *info)
{
	int i;

	/* set up sector start adress table */
	if (info->flash_id & FLASH_BTYPE) {
		/* set sector offsets for bottom boot block type	*/
		info->start[0] = base + 0x00000000;
		info->start[1] = base + 0x00004000;
		info->start[2] = base + 0x00006000;
		info->start[3] = base + 0x00008000;
		for (i = 4; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00010000) - 0x00030000;
		}
	} else {
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		info->start[i--] = base + info->size - 0x00004000;
		info->start[i--] = base + info->size - 0x00006000;
		info->start[i--] = base + info->size - 0x00008000;
		for (; i >= 0; i--) {
			info->start[i] = base + i * 0x00010000;
		}
	}

}

/*-----------------------------------------------------------------------
 */
void flash_print_info  (flash_info_t *info)
{
	int i;
        int k;
        int size;
        int erased;
        volatile unsigned long *flash;

	if (info->flash_id == FLASH_UNKNOWN) {
		printf ("missing or unknown FLASH type\n");
		return;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:	printf ("AMD ");		break;
	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
	case FLASH_MAN_SST:	printf ("SST ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
				break;
	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
				break;
	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
				break;
	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				break;
	}

	printf ("  Size: %ld MB in %d Sectors\n",
		info->size >> 20, info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
                /*
                 * Check if whole sector is erased
                 */
                if (i != (info->sector_count-1))
                  size = info->start[i+1] - info->start[i];
                else
                  size = info->start[0] + info->size - info->start[i];
                erased = 1;
                flash = (volatile unsigned long *)info->start[i];
                size = size >> 2;        /* divide by 4 for longword access */
                for (k=0; k<size; k++)
                  {
                    if (*flash++ != 0xffffffff)
                      {
                        erased = 0;
                        break;
                      }
                  }

		if ((i % 5) == 0)
			printf ("\n   ");
#if 0 /* test-only */
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     "
#else
		printf (" %08lX%s%s",
			info->start[i],
			erased ? " E" : "  ",
			info->protect[i] ? "RO " : "   "
#endif
		);
	}
	printf ("\n");
}

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


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

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	FLASH_WORD_SIZE value;
	ulong base = (ulong)addr;
        volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;

	/* Write auto select command: read Manufacturer ID */
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;

#ifdef CONFIG_ADCIOP
	value = addr2[2];  
#else
	value = addr2[0];
#endif

	switch (value) {
	case (FLASH_WORD_SIZE)AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	case (FLASH_WORD_SIZE)FUJ_MANUFACT:
		info->flash_id = FLASH_MAN_FUJ;
		break;
	case (FLASH_WORD_SIZE)SST_MANUFACT:
		info->flash_id = FLASH_MAN_SST;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

#ifdef CONFIG_ADCIOP
	value = addr2[0];			/* device ID		*/
        //        printf("\ndev_code=%x\n", value);
#else
	value = addr2[1];			/* device ID		*/
#endif