uboot-vybrid_public/board/mx1fs2/flash.c

/*
 * (C) 2000-2004 Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 * (C) 2003 August Hoeraendl, Logotronic GmbH
 *
 * 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
 */

#undef CONFIG_FLASH_16BIT

#include <common.h>

#if defined CFG_JFFS_CUSTOM_PART
#include <jffs2/jffs2.h>
#endif

#define FLASH_BANK_SIZE MX1FS2_FLASH_BANK_SIZE
#define MAIN_SECT_SIZE  MX1FS2_FLASH_SECT_SIZE

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

/*
 * NOTE - CONFIG_FLASH_16BIT means the CPU interface is 16-bit, it
 *        has nothing to do with the flash chip being 8-bit or 16-bit.
 */
#ifdef CONFIG_FLASH_16BIT
typedef unsigned short FLASH_PORT_WIDTH;
typedef volatile unsigned short FLASH_PORT_WIDTHV;

#define	FLASH_ID_MASK	0xFFFF
#else
typedef unsigned long FLASH_PORT_WIDTH;
typedef volatile unsigned long FLASH_PORT_WIDTHV;

#define	FLASH_ID_MASK	0xFFFFFFFF
#endif

#define FPW	FLASH_PORT_WIDTH
#define FPWV	FLASH_PORT_WIDTHV

#define ORMASK(size) ((-size) & OR_AM_MSK)

/*-----------------------------------------------------------------------
 * Functions
 */
#if 0
static ulong flash_get_size(FPWV * addr, flash_info_t * info);
static void flash_get_offsets(ulong base, flash_info_t * info);
#endif
static void flash_reset(flash_info_t * info);
static int write_word_intel(flash_info_t * info, FPWV * dest, FPW data);
static int write_word_amd(flash_info_t * info, FPWV * dest, FPW data);
#define write_word(in, de, da)   write_word_amd(in, de, da)
#ifdef CFG_FLASH_PROTECTION
static void flash_sync_real_protect(flash_info_t * info);
#endif

#if defined CFG_JFFS_CUSTOM_PART

/**
 * jffs2_part_info - get information about a JFFS2 partition
 *
 * @part_num: number of the partition you want to get info about
 * @return:   struct part_info* in case of success, 0 if failure
 */

static struct part_info part;
static int current_part = -1;

struct part_info *
jffs2_part_info(int part_num)
{
	void *jffs2_priv_saved = part.jffs2_priv;

	printf("jffs2_part_info: part_num=%i\n", part_num);

	if (current_part == part_num)
		return &part;

	/* rootfs                                                 */
	if (part_num == 0) {
		memset(&part, 0, sizeof (part));

		part.offset = (char *) MX1FS2_JFFS2_PART0_START;
		part.size = MX1FS2_JFFS2_PART0_SIZE;

		/* Mark the struct as ready */
		current_part = part_num;

		printf("part.offset = 0x%08x\n", (unsigned int) part.offset);
		printf("part.size   = 0x%08x\n", (unsigned int) part.size);
	}

	/* userfs                                    */
	if (part_num == 1) {
		memset(&part, 0, sizeof (part));

		part.offset = (char *) MX1FS2_JFFS2_PART1_START;
		part.size = MX1FS2_JFFS2_PART1_SIZE;

		/* Mark the struct as ready */
		current_part = part_num;

		printf("part.offset = 0x%08x\n", (unsigned int) part.offset);
		printf("part.size   = 0x%08x\n", (unsigned int) part.size);
	}

	if (current_part == part_num) {
		part.usr_priv = &current_part;
		part.jffs2_priv = jffs2_priv_saved;
		return &part;
	}

	printf("jffs2_part_info: end of partition table\n");
	return 0;
}
#endif				/* CFG_JFFS_CUSTOM_PART */

/*-----------------------------------------------------------------------
 * flash_init()
 *
 * sets up flash_info and returns size of FLASH (bytes)
 */
ulong
flash_init(void)
{
	int i, j;
	ulong size = 0;

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
		ulong flashbase = 0;
		flash_info[i].flash_id =
		    (FLASH_MAN_AMD & FLASH_VENDMASK) |
		    (FLASH_AM640U & FLASH_TYPEMASK);
		flash_info[i].size = FLASH_BANK_SIZE;
		flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
		memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
		switch (i) {
		case 0:
			flashbase = MX1FS2_FLASH_BASE;
			break;
		default:
			panic("configured too many flash banks!\n");
			break;
		}
		for (j = 0; j < flash_info[i].sector_count; j++) {
			flash_info[i].start[j] = flashbase + j * MAIN_SECT_SIZE;
		}
		size += flash_info[i].size;
	}

	/* Protect monitor and environment sectors */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_FLASH_BASE,
		      CFG_FLASH_BASE + _bss_start - _armboot_start,
		      &flash_info[0]);

	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR,
		      CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);

	return size;
}

/*-----------------------------------------------------------------------
 */
static void
flash_reset(flash_info_t * info)
{
	FPWV *base = (FPWV *) (info->start[0]);

	/* Put FLASH back in read mode */
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
		*base = (FPW) 0x00FF00FF;	/* Intel Read Mode */
	else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
		*base = (FPW) 0x00F000F0;	/* AMD Read Mode */
}

/*-----------------------------------------------------------------------
 */
#if 0
static void
flash_get_offsets(ulong base, flash_info_t * info)
{
	int i;

	/* set up sector start address table */
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL
	    && (info->flash_id & FLASH_BTYPE)) {
		int bootsect_size;	/* number of bytes/boot sector  */
		int sect_size;	/* number of bytes/regular sector */

		bootsect_size = 0x00002000 * (sizeof (FPW) / 2);
		sect_size = 0x00010000 * (sizeof (FPW) / 2);

		/* set sector offsets for bottom boot block type        */
		for (i = 0; i < 8; ++i) {
			info->start[i] = base + (i * bootsect_size);
		}
		for (i = 8; i < info->sector_count; i++) {
			info->start[i] = base + ((i - 7) * sect_size);
		}
	} else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD
		   && (info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U) {

		int sect_size;	/* number of bytes/sector */

		sect_size = 0x00010000 * (sizeof (FPW) / 2);

		/* set up sector start address table (uniform sector type) */
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * sect_size);
	}
}
#endif /* 0 */

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

void
flash_print_info(flash_info_t * info)
{
	int i;
	uchar *boottype;
	uchar *bootletter;
	uchar *fmt;
	uchar botbootletter[] = "B";
	uchar topbootletter[] = "T";
	uchar botboottype[] = "bottom boot sector";
	uchar topboottype[] = "top boot sector";

	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_BM:
		printf("BRIGHT MICRO ");
		break;
	case FLASH_MAN_FUJ:
		printf("FUJITSU ");
		break;
	case FLASH_MAN_SST:
		printf("SST ");
		break;
	case FLASH_MAN_STM:
		printf("STM ");
		break;
	case FLASH_MAN_INTEL:
		printf("INTEL ");
		break;
	default:
		printf("Unknown Vendor ");
		break;
	}

	/* check for top or bottom boot, if it applies */
	if (info->flash_id & FLASH_BTYPE) {
		boottype = botboottype;
		bootletter = botbootletter;
	} else {
		boottype = topboottype;
		bootletter = topbootletter;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM640U:
		fmt = "29LV641D (64 Mbit, uniform sectors)\n";
		break;
	case FLASH_28F800C3B:
	case FLASH_28F800C3T:
		fmt = "28F800C3%s (8 Mbit, %s)\n";
		break;
	case FLASH_INTEL800B:
	case FLASH_INTEL800T:
		fmt = "28F800B3%s (8 Mbit, %s)\n";
		break;
	case FLASH_28F160C3B:
	case FLASH_28F160C3T:
		fmt = "28F160C3%s (16 Mbit, %s)\n";
		break;
	case FLASH_INTEL160B:
	case FLASH_INTEL160T:
		fmt = "28F160B3%s (16 Mbit, %s)\n";
		break;
	case FLASH_28F320C3B:
	case FLASH_28F320C3T:
		fmt = "28F320C3%s (32 Mbit, %s)\n";
		break;
	case FLASH_INTEL320B:
	case FLASH_INTEL320T:
		fmt = "28F320B3%s (32 Mbit, %s)\n";
		break;
	case FLASH_28F640C3B:
	case FLASH_28F640C3T:
		fmt = "28F640C3%s (64 Mbit, %s)\n";
		break;
	case FLASH_INTEL640B:
	case FLASH_INTEL640T:
		fmt = "28F640B3%s (64 Mbit, %s)\n";
		break;
	default:
		fmt = "Unknown Chip Type\n";
		break;
	}

	printf(fmt, bootletter, boottype);

	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) {
		if ((i % 5) == 0) {
			printf("\n   ");
		}

		printf(" %08lX%s", info->start[i],
		       info->protect[i] ? " (RO)" : "     ");
	}

	printf("\n");
}

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

/*
 * The following code cannot be run from FLASH!
 */

#if 0
ulong
flash_get_size(FPWV * addr, flash_info_t * info)
{
	/* Write auto select command: read Manufacturer ID */

	/* Write auto select command sequence and test FLASH answer */
	addr[0x0555] = (FPW) 0x00AA00AA;	/* for AMD, Intel ignores this */
	addr[0x02AA] = (FPW) 0x00550055;	/* for AMD, Intel ignores this */
	addr[0x0555] = (FPW) 0x00900090;	/* selects Intel or AMD */

	/* The manufacturer codes are only 1 byte, so just use 1 byte.
	 * This works for any bus width and any FLASH device width.
	 */
	switch (addr[0] & 0xff) {

	case (uchar) AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;

	case (uchar) INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;

	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		break;
	}

	/* Check 16 bits or 32 bits of ID so work on 32 or 16 bit bus. */
	if (info->flash_id != FLASH_UNKNOWN)
		switch (addr[1]) {

		case (FPW) AMD_ID_LV640U:	/* 29LV640 and 29LV641 have same ID */
			info->flash_id += FLASH_AM640U;
			info->sector_count = 128;
			info->size = 0x00800000 * (sizeof (FPW) / 2);
			break;	/* => 8 or 16 MB        */

		case (FPW) INTEL_ID_28F800C3B:
			info->flash_id += FLASH_28F800C3B;
			info->sector_count = 23;
			info->size = 0x00100000 * (sizeof (FPW) / 2);
			break;	/* => 1 or 2 MB         */

		case (FPW) INTEL_ID_28F800B3B:
			info->flash_id += FLASH_INTEL800B;
			info->sector_count = 23;
			info->size = 0x00100000 * (sizeof (FPW) / 2);
			break;	/* => 1 or 2 MB         */

		case (FPW) INTEL_ID_28F160C3B:
			info->flash_id += FLASH_28F160C3B;
			info->sector_count = 39;
			info->size = 0x00200000 * (sizeof (FPW) / 2);
			break;	/* => 2 or 4 MB         */

		case (FPW) INTEL_ID_28F160B3B:
			info->flash_id += FLASH_INTEL160B;
			info->sector_count = 39;
			info->size = 0x00200000 * (sizeof (FPW) / 2);
			break;	/* => 2 or 4 MB         */

		case (FPW) INTEL_ID_28F320C3B:
			info->flash_id += FLASH_28F320C3B;
			info->sector_count = 71;
			info->size = 0x00400000 * (sizeof (FPW) / 2);
			break;	/* => 4 or 8 MB         */

		case (FPW) INTEL_ID_28F320B3B:
			info->flash_id += FLASH_INTEL320B;
			info->sector_count = 71;
			info->size = 0x00400000 * (sizeof (FPW) / 2);
			break;	/* => 4 or 8 MB         */

		case (FPW) INTEL_ID_28F640C3B:
			info->flash_id += FLASH_28F640C3B;
			info->sector_count = 135;
			info->size = 0x00800000 * (sizeof (FPW) / 2);
			break;	/* => 8 or 16 MB        */

		case (FPW) INTEL_ID_28F640B3B:
			info->flash_id += FLASH_INTEL640B;
			info->sector_count = 135;
			info->size = 0x00800000 * (sizeof (FPW) / 2);
			break;	/* => 8 or 16 MB        */

		default:
			info->flash_id = FLASH_UNKNOWN;
			info->sector_count = 0;
			info->size = 0;
			return (0);	/* => no or unknown flash */
		}

	flash_get_offsets((ulong) addr, info);

	/* Put FLASH back in read mode */
	flash_reset(info);

	return (info->size);
}
#endif /* 0 */

#ifdef CFG_FLASH_PROTECTION
/*-----------------------------------------------------------------------
 */

static void
flash_sync_real_protect(flash_info_t * info)
{
	FPWV *addr = (FPWV *) (info->start[0]);
	FPWV *sect;
	int i;

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F800C3B:
	case FLASH_28F800C3T:
	case FLASH_28F160C3B:
	case FLASH_28F160C3T:
	case FLASH_28F320C3B:
	case FLASH_28F320C3T:
	case FLASH_28F640C3B:
	case FLASH_28F640C3T:
		/* check for protected sectors */
		*addr = (FPW) 0x00900090;
		for (i = 0; i < info->sector_count; i++) {
			/* read sector protection at sector address, (A7 .. A0) = 0x02.
			 * D0 = 1 for each device if protected.
			 * If at least one device is protected the sector is marked
			 * protected, but mixed protected and  unprotected devices
			 * within a sector should never happen.
			 */
			sect = (FPWV *) (info->start[i]);
			info->protect[i] =
			    (sect[2] & (FPW) (0x00010001)) ? 1 : 0;
		}

		/* Put FLASH back in read mode */
		flash_reset(info);
		break;

	case FLASH_AM640U:
	default:
		/* no hardware protect that we support */
		break;
	}
}
#endif

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

int
flash_erase(flash_info_t * info, int s_first, int s_last)
{
	FPWV *addr;
	int flag, prot, sect;
	int intel = (info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL;
	ulong start, now, last;
	int rcode = 0;

	if ((s_first < 0) || (s_first > s_last)) {
		if (info->flash_id == FLASH_UNKNOWN) {
			printf("- missing\n");
		} else {
			printf("- no sectors to erase\n");
		}
		return 1;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_INTEL800B:
	case FLASH_INTEL160B:
	case FLASH_INTEL320B:
	case FLASH_INTEL640B:
	case FLASH_28F800C3B:
	case FLASH_28F160C3B:
	case FLASH_28F320C3B:
	case FLASH_28F640C3B:
	case FLASH_AM640U:
		break;
	case FLASH_UNKNOWN:
	default:
		printf("Can't erase unknown flash type %08lx - aborted\n",
		       info->flash_id);
		return 1;
	}

	prot = 0;
	for (sect = s_first; sect <= s_last; ++sect) {
		if (info->protect[sect]) {
			prot++;
		}
	}

	if (prot) {
		printf("- Warning: %d protected sectors will not be erased!\n",
		       prot);
	} else {
		printf("\n");
	}

	start = get_timer(0);
	last = start;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last && rcode == 0; sect++) {

		if (info->protect[sect] != 0)	/* protected, skip it */
			continue;

		/* Disable interrupts which might cause a timeout here */
		flag = disable_interrupts();

		addr = (FPWV *) (info->start[sect]);
		if (intel) {
			*addr = (FPW) 0x00500050;	/* clear status register */
			*addr = (FPW) 0x00200020;	/* erase setup */
			*addr = (FPW) 0x00D000D0;	/* erase confirm */
		} else {
			/* must be AMD style if not Intel */
			FPWV *base;	/* first address in bank */

			base = (FPWV *) (info->start[0]);
			base[0x0555] = (FPW) 0x00AA00AA;	/* unlock */
			base[0x02AA] = (FPW) 0x00550055;	/* unlock */
			base[0x0555] = (FPW) 0x00800080;	/* erase mode */
			base[0x0555] = (FPW) 0x00AA00AA;	/* unlock */
			base[0x02AA] = (FPW) 0x00550055;	/* unlock */
			*addr = (FPW) 0x00300030;	/* erase sector */
		}

		/* re-enable interrupts if necessary */
		if (flag)
			enable_interrupts();

		/* wait at least 50us for AMD, 80us for Intel.
		 * Let's wait 1 ms.
		 */
		udelay(1000);

		while ((*addr & (FPW) 0x00800080) != (FPW) 0x00800080) {
			if ((now = get_timer(0)) - start > CFG_FLASH_ERASE_TOUT) {
				printf("Timeout\n");

				if (intel) {
					/* suspend erase        */
					*addr = (FPW) 0x00B000B0;
				}

				flash_reset(info);	/* reset to read mode */
				rcode = 1;	/* failed */
				break;
			}

			/* show that we're waiting */
			if ((now - last) > 1000) {	/* every second */
				putc('.');
				last = now;
			}
		}

		flash_reset(info);	/* reset to read mode   */
	}

	printf(" done\n");
	return rcode;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
int
bad_write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
	FPW data = 0;		/* 16 or 32 bit word, matches flash bus width on MPC8XX */
	int bytes;		/* number of bytes to program in current word         */
	int left;		/* number of bytes left to program                    */
	int i, res;

	for (left = cnt, res = 0;
	     left > 0 && res == 0;
	     addr += sizeof (data), left -= sizeof (data) - bytes) {

		bytes = addr & (sizeof (data) - 1);
		addr &= ~(sizeof (data) - 1);

		/* combine source and destination data so can program
		 * an entire word of 16 or 32 bits
		 */
		for (i = 0; i < sizeof (data); i++) {
			data <<= 8;
			if (i < bytes || i - bytes >= left)
				data += *((uchar *) addr + i);
			else
				data += *src++;
		}

		/* write one word to the flash */
		switch (info->flash_id & FLASH_VENDMASK) {
		case FLASH_MAN_AMD:
			res = write_word_amd(info, (FPWV *) addr, data);
			break;
		case FLASH_MAN_INTEL:
			res = write_word_intel(info, (FPWV *) addr, data);
			break;
		default:
			/* unknown flash type, error! */
			printf("missing or unknown FLASH type\n");
			res = 1;	/* not really a timeout, but gives error */
			break;
		}
	}

	return (res);
}

/**
 * write_buf: - Copy memory to flash.
 *
 * @param info:
 * @param src:	source of copy transaction
 * @param addr:	where to copy to
 * @param cnt: 	number of bytes to copy
 *
 * @return	error code
 */

int
write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
	ulong cp, wp;
	FPW data;
	int l;
	int i, rc;

	wp = (addr & ~1);	/* get lower word aligned address */

	/* handle unaligned start bytes */
	if ((l = addr - wp) != 0) {
		data = 0;
		for (i = 0, cp = wp; i < l; ++i, ++cp) {
			data = (data >> 8) | (*(uchar *) cp << 8);
		}
		for (; i < 2 && cnt > 0; ++i) {
			data = (data >> 8) | (*src++ << 8);
			--cnt;
			++cp;
		}
		for (; cnt == 0 && i < 2; ++i, ++cp) {
			data = (data >> 8) | (*(uchar *) cp << 8);
		}

		if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
			return (rc);
		}
		wp += 2;
	}

	/* handle word aligned part */
	while (cnt >= 2) {
		/* data = *((vushort*)src); */
		data = *((FPW *) src);
		if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
			return (rc);
		}
		src += sizeof (FPW);
		wp += sizeof (FPW);
		cnt -= sizeof (FPW);
	}

	if (cnt == 0)
		return ERR_OK;

	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
		data = (data >> 8) | (*src++ << 8);
		--cnt;
	}
	for (; i < 2; ++i, ++cp) {
		data = (data >> 8) | (*(uchar *) cp << 8);
	}

	return write_word(info, (FPWV *)wp, data);
}

/*-----------------------------------------------------------------------
 * Write a word to Flash for AMD FLASH
 * A word is 16 or 32 bits, whichever the bus width of the flash bank
 * (not an individual chip) is.
 *
 * returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int
write_word_amd(flash_info_t * info, FPWV * dest, FPW data)
{
	ulong start;
	int flag;
	int res = 0;		/* result, assume success       */
	FPWV *base;		/* first address in flash bank  */

	/* Check if Flash is (sufficiently) erased */
	if ((*dest & data) != data) {
		return (2);
	}

	base = (FPWV *) (info->start[0]);
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	base[0x0555] = (FPW) 0x00AA00AA;	/* unlock */
	base[0x02AA] = (FPW) 0x00550055;	/* unlock */
	base[0x0555] = (FPW) 0x00A000A0;	/* selects program mode */

	*dest = data;		/* start programming the data   */

	/* re-enable interrupts if necessary */
	if (flag)
		enable_interrupts();

	start = get_timer(0);

	/* data polling for D7 */
	while (res == 0
	       && (*dest & (FPW) 0x00800080) != (data & (FPW) 0x00800080)) {
		if (get_timer(0) - start > CFG_FLASH_WRITE_TOUT) {
			*dest = (FPW) 0x00F000F0;	/* reset bank */
			printf("SHA timeout\n");
			res = 1;
		}
	}

	return (res);
}

/*-----------------------------------------------------------------------
 * Write a word to Flash for Intel FLASH
 * A word is 16 or 32 bits, whichever the bus width of the flash bank
 * (not an individual chip) is.
 *
 * returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int
write_word_intel(flash_info_t * info, FPWV * dest, FPW data)
{
	ulong start;
	int flag;
	int res = 0;		/* result, assume success       */

	/* Check if Flash is (sufficiently) erased */
	if ((*dest & data) != data) {
		return (2);
	}

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	*dest = (FPW) 0x00500050;	/* clear status register        */
	*dest = (FPW) 0x00FF00FF;	/* make sure in read mode       */
	*dest = (FPW) 0x00400040;	/* program setup                */

	*dest = data;		/* start programming the data   */

	/* re-enable interrupts if necessary */
	if (flag)
		enable_interrupts();

	start = get_timer(0);

	while (res == 0 && (*dest & (FPW) 0x00800080) != (FPW) 0x00800080) {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			*dest = (FPW) 0x00B000B0;	/* Suspend program      */
			res = 1;
		}
	}

	if (res == 0 && (*dest & (FPW) 0x00100010))
		res = 1;	/* write failed, time out error is close enough */

	*dest = (FPW) 0x00500050;	/* clear status register        */
	*dest = (FPW) 0x00FF00FF;	/* make sure in read mode       */

	return (res);
}

#ifdef CFG_FLASH_PROTECTION
/*-----------------------------------------------------------------------
 */
int
flash_real_protect(flash_info_t * info, long sector, int prot)
{
	int rcode = 0;		/* assume success */
	FPWV *addr;		/* address of sector */
	FPW value;

	addr = (FPWV *) (info->start[sector]);

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F800C3B:
	case FLASH_28F800C3T:
	case FLASH_28F160C3B:
	case FLASH_28F160C3T:
	case FLASH_28F320C3B:
	case FLASH_28F320C3T:
	case FLASH_28F640C3B:
	case FLASH_28F640C3T:
		flash_reset(info);	/* make sure in read mode */
		*addr = (FPW) 0x00600060L;	/* lock command setup */
		if (prot)
			*addr = (FPW) 0x00010001L;	/* lock sector */
		else
			*addr = (FPW) 0x00D000D0L;	/* unlock sector */
		flash_reset(info);	/* reset to read mode */

		/* now see if it really is locked/unlocked as requested */
		*addr = (FPW) 0x00900090;
		/* read sector protection at sector address, (A7 .. A0) = 0x02.
		 * D0 = 1 for each device if protected.
		 * If at least one device is protected the sector is marked
		 * protected, but return failure. Mixed protected and
		 * unprotected devices within a sector should never happen.
		 */
		value = addr[2] & (FPW) 0x00010001;
		if (value == 0)
			info->protect[sector] = 0;
		else if (value == (FPW) 0x00010001)
			info->protect[sector] = 1;
		else {
			/* error, mixed protected and unprotected */
			rcode = 1;
			info->protect[sector] = 1;
		}
		if (info->protect[sector] != prot)
			rcode = 1;	/* failed to protect/unprotect as requested */

		/* reload all protection bits from hardware for now */
		flash_sync_real_protect(info);
		break;

	case FLASH_AM640U:
	default:
		/* no hardware protect that we support */
		info->protect[sector] = prot;
		break;
	}

	return rcode;
}
#endif