board/amcc/taihu/flash.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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
 */

/*
 * Modified 4/5/2001
 * Wait for completion of each sector erase command issued
 * 4/5/2001
 * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
 */

#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>

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

#undef DEBUG
#ifdef DEBUG
#define DEBUGF(x...) printf(x)
#else
#define DEBUGF(x...)
#endif				/* DEBUG */

#define CONFIG_SYS_FLASH_CHAR_SIZE unsigned char
#define CONFIG_SYS_FLASH_CHAR_ADDR0 (0x0aaa)
#define CONFIG_SYS_FLASH_CHAR_ADDR1 (0x0555)
/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size(vu_long * addr, flash_info_t * info);
static void flash_get_offsets(ulong base, flash_info_t * info);
static int write_word(flash_info_t * info, ulong dest, ulong data);
#ifdef FLASH_BASE1_PRELIM
static int write_word_1(flash_info_t * info, ulong dest, ulong data);
static int write_word_2(flash_info_t * info, ulong dest, ulong data);
static int flash_erase_1(flash_info_t * info, int s_first, int s_last);
static int flash_erase_2(flash_info_t * info, int s_first, int s_last);
static ulong flash_get_size_1(vu_long * addr, flash_info_t * info);
static ulong flash_get_size_2(vu_long * addr, flash_info_t * info);
#endif

unsigned long flash_init(void)
{
	unsigned long size_b0, size_b1=0;
	int i;

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

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

	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);
	}

	if (size_b0) {
		/* Setup offsets */
		flash_get_offsets(FLASH_BASE0_PRELIM, &flash_info[0]);
		/* Monitor protection ON by default */
		(void)flash_protect(FLAG_PROTECT_SET,
				    CONFIG_SYS_MONITOR_BASE,
				    CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN - 1,
				    &flash_info[0]);
#ifdef CONFIG_ENV_IS_IN_FLASH
		(void)flash_protect(FLAG_PROTECT_SET, CONFIG_ENV_ADDR,
				    CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
				    &flash_info[0]);
		(void)flash_protect(FLAG_PROTECT_SET, CONFIG_ENV_ADDR_REDUND,
				    CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
				    &flash_info[0]);
#endif
		/* Also protect sector containing initial power-up instruction */
		/* (flash_protect() checks address range - other call ignored) */
		(void)flash_protect(FLAG_PROTECT_SET,
				    0xFFFFFFFC, 0xFFFFFFFF, &flash_info[0]);

		flash_info[0].size = size_b0;
	}
#ifdef FLASH_BASE1_PRELIM
	size_b1 =
	    flash_get_size((vu_long *) FLASH_BASE1_PRELIM, &flash_info[1])*2;

	if (flash_info[1].flash_id == FLASH_UNKNOWN) {
		printf("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
		       size_b1, size_b1 << 20);
	}

	if (size_b1) {
		/* Setup offsets */
		flash_get_offsets(FLASH_BASE1_PRELIM, &flash_info[1]);
		flash_info[1].size = size_b1;
	}
#endif
	return (size_b0 + size_b1);
}

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_SST) ||
	    (info->flash_id == FLASH_AM040)) {
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000);
	} else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00010000*2);
		}
	} else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N ) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00020000*2);
		}
	} else {
		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_STM:
		printf("STM ");
		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_AM040:
		printf("AM29F040 (512 Kbit, uniform sector size)\n");
		break;
	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_AMD016:
		printf("AM29F016D (16 Mbit, uniform sector size)\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;
	case FLASH_AM033C:
		printf("AM29LV033C (32 Mbit, top boot sector)\n");
		break;
	case FLASH_AMLV128U:
		printf("AM29LV128U (128 Mbit * 2, top boot sector)\n");
		break;
	case FLASH_SST800A:
		printf("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
		break;
	case FLASH_SST160A:
		printf("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
		break;
	case FLASH_STMW320DT:
		printf ("M29W320DT (32 M, top sector)\n");
		break;
	case FLASH_S29GL128N:
		printf ("S29GL128N (256 Mbit, uniform sector size)\n");
		break;
	default:
		printf("Unknown Chip Type\n");
		break;
	}

	printf("  Size: %ld KB in %d Sectors\n",
	       info->size >> 10, 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   ");
		printf(" %08lX%s%s",
		       info->start[i],
		       erased ? " E" : "  ", info->protect[i] ? "RO " : "   ");
	}
	printf("\n");
	return;
}


/*
 * The following code cannot be run from FLASH!
 */
#ifdef FLASH_BASE1_PRELIM
static ulong flash_get_size(vu_long * addr, flash_info_t * info)
{
	if ((ulong)addr == FLASH_BASE1_PRELIM) {
		return flash_get_size_2(addr, info);
	} else {
		return flash_get_size_1(addr, info);
	}
}

static ulong flash_get_size_1(vu_long * addr, flash_info_t * info)
#else
static ulong flash_get_size(vu_long * addr, flash_info_t * info)
#endif
{
	short i;
	CONFIG_SYS_FLASH_WORD_SIZE value;
	ulong base = (ulong) addr;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) addr;

	DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr);

	/* Write auto select command: read Manufacturer ID */
	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00900090;
	udelay(1000);

	value = addr2[0];
	DEBUGF("FLASH MANUFACT: %x\n", value);

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

	value = addr2[1];	/* device ID            */
	DEBUGF("\nFLASH DEVICEID: %x\n", value);

	switch (value) {
	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x0080000;	/* => 512 ko */
		break;

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_F040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x0080000;	/* => 512 ko */
		break;

	case (CONFIG_SYS_FLASH_WORD_SIZE) STM_ID_M29W040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x0080000;	/* => 512 ko */
		break;

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_F016D:
		info->flash_id += FLASH_AMD016;
		info->sector_count = 32;
		info->size = 0x00200000;
		break;		/* => 2 MB              */

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV033C:
		info->flash_id += FLASH_AMDLV033C;
		info->sector_count = 64;
		info->size = 0x00400000;
		break;		/* => 4 MB              */

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;		/* => 0.5 MB            */

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;		/* => 0.5 MB            */

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;		/* => 1 MB              */

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;		/* => 1 MB              */

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV160T:
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;		/* => 2 MB              */

	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV160B:
		info->flash_id += FLASH_AM160B;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;		/* => 2 MB              */
	default:
		info->flash_id = FLASH_UNKNOWN;
		return 0;	/* => no or unknown flash */
	}

	/* set up sector start address table */
	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMD016)) {
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000);
	}
	else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) {
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000 * 2);
	} else {
		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;
			}
		}
	}

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
		/* D0 = 1 if protected */
		addr2 = (volatile CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[i]);

		/* For AMD29033C flash we need to resend the command of *
		 * reading flash protection for upper 8 Mb of flash     */
		if (i == 32) {
			addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
			addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
			addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x90909090;
		}

		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
			info->protect[i] = 0;
		else
			info->protect[i] = addr2[2] & 1;
	}

	/* issue bank reset to return to read mode */
	addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00F000F0;

	return info->size;
}

static int wait_for_DQ7_1(flash_info_t * info, int sect)
{
	ulong start, now, last;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr =
	    (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

	start = get_timer(0);
	last = start;
	while ((addr[0] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
	       (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) {
		if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
			printf("Timeout\n");
			return -1;
		}
		/* show that we're waiting */
		if ((now - last) > 1000) {	/* every second */
			putc('.');
			last = now;
		}
	}
	return 0;
}

#ifdef FLASH_BASE1_PRELIM
int flash_erase(flash_info_t * info, int s_first, int s_last)
{
	if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_STMW320DT)) {
		return flash_erase_2(info, s_first, s_last);
	} else {
		return flash_erase_1(info, s_first, s_last);
	}
}

static int flash_erase_1(flash_info_t * info, int s_first, int s_last)
#else
int flash_erase(flash_info_t * info, int s_first, int s_last)
#endif
{
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;
	int i;

	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;
	}

	if (info->flash_id == FLASH_UNKNOWN) {
		printf("Can't erase unknown flash type - aborted\n");
		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");
	}

	l_sect = -1;

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

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

			if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00500050;	/* block erase */
				for (i = 0; i < 50; i++)
					udelay(1000);	/* wait 1 ms */
			} else {
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00300030;	/* sector erase */
			}
			l_sect = sect;
			/*
			 * Wait for each sector to complete, it's more
			 * reliable.  According to AMD Spec, you must
			 * issue all erase commands within a specified
			 * timeout.  This has been seen to fail, especially
			 * if printf()s are included (for debug)!!
			 */
			wait_for_DQ7_1(info, sect);
		}
	}

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

	/* wait at least 80us - let's wait 1 ms */
	udelay(1000);

	/* reset to read mode */
	addr = (CONFIG_SYS_FLASH_WORD_SIZE *) info->start[0];
	addr[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00F000F0;	/* reset bank */

	printf(" done\n");
	return 0;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
int write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
	ulong cp, wp, data;
	int i, l, rc;

	wp = (addr & ~3);	/* 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);
		}
		for (; i < 4 && cnt > 0; ++i) {
			data = (data << 8) | *src++;
			--cnt;
			++cp;
		}
		for (; cnt == 0 && i < 4; ++i, ++cp) {
			data = (data << 8) | (*(uchar *) cp);
		}

		if ((rc = write_word(info, wp, data)) != 0) {
			return rc;
		}
		wp += 4;
	}

	/*
	 * handle word aligned part
	 */
	while (cnt >= 4) {
		data = 0;
		for (i = 0; i < 4; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_word(info, wp, data)) != 0) {
			return rc;
		}
		wp += 4;
		cnt -= 4;
	}

	if (cnt == 0) {
		return 0;
	}

	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
		data = (data << 8) | *src++;
		--cnt;
	}
	for (; i < 4; ++i, ++cp) {
		data = (data << 8) | (*(uchar *) cp);
	}

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

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
#ifdef FLASH_BASE1_PRELIM
static int write_word(flash_info_t * info, ulong dest, ulong data)
{
	if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_STMW320DT)) {
		return write_word_2(info, dest, data);
	} else {
		return write_word_1(info, dest, data);
	}
}

static int write_word_1(flash_info_t * info, ulong dest, ulong data)
#else
static int write_word(flash_info_t * info, ulong dest, ulong data)
#endif
{
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE *dest2 = (CONFIG_SYS_FLASH_WORD_SIZE *) dest;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *) & data;
	ulong start;
	int i;

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

	for (i = 0; i < 4 / sizeof(CONFIG_SYS_FLASH_WORD_SIZE); i++) {
		int flag;

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

		addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
		addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
		addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00A000A0;

		dest2[i] = data2[i];

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

		/* data polling for D7 */
		start = get_timer(0);
		while ((dest2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
		       (data2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080)) {

			if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
				return 1;
			}
		}
	}

	return 0;
}

#ifdef FLASH_BASE1_PRELIM

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size_2(vu_long * addr, flash_info_t * info)
{
	short i;
	CONFIG_SYS_FLASH_CHAR_SIZE value;
	ulong base = (ulong) addr;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) addr;

	DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr);

	/* Write auto select command: read Manufacturer ID */
	addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
	addr2[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
	addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x90909090;
	udelay(1000);

	value = (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0];
	DEBUGF("FLASH MANUFACT: %x\n", value);

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

	value = (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[2];	/* device ID */
	DEBUGF("\nFLASH DEVICEID: %x\n", value);

	switch (value) {
	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x0080000;	/* => 512 ko */
		break;

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_F040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x0080000;	/* => 512 ko */
		break;

	case (CONFIG_SYS_FLASH_CHAR_SIZE) STM_ID_M29W040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x0080000;	/* => 512 ko */
		break;

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_F016D:
		info->flash_id += FLASH_AMD016;
		info->sector_count = 32;
		info->size = 0x00200000;
		break;			/* => 2 MB */

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV033C:
		info->flash_id += FLASH_AMDLV033C;
		info->sector_count = 64;
		info->size = 0x00400000;
		break;			/* => 4 MB */

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;			/* => 0.5 MB */

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;			/* => 0.5 MB */

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;			/* => 1 MB */

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;			/* => 1 MB */

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV160T:
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;			/* => 2 MB */

	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV160B:
		info->flash_id += FLASH_AM160B;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;			/* => 2 MB */
	case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_MIRROR:
		if ((CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1c] == (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_LV128U_2
				&& (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1e] ==  (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_LV128U_3) {
			info->flash_id += FLASH_AMLV128U;
			info->sector_count = 256;
			info->size = 0x01000000;
		} else if ((CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1c] == (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_GL128N_2
				&& (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1e] ==  (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_GL128N_3 ) {
			info->flash_id += FLASH_S29GL128N;
			info->sector_count = 128;
			info->size = 0x01000000;
		}
		else
			info->flash_id = FLASH_UNKNOWN;
		break;			/* => 2 MB */

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

	/* set up sector start address table */
	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) ||
	    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMD016)) {
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000);
	} else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) {
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000);
	} else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N ) {
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00020000);
	} else {
		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;
			}
		}
	}

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
		/* D0 = 1 if protected */
		addr2 = (volatile CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[i]);

		/* For AMD29033C flash we need to resend the command of *
		 * reading flash protection for upper 8 Mb of flash     */
		if (i == 32) {
			addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
			addr2[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
			addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x90909090;
		}

		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
			info->protect[i] = 0;
		else
			info->protect[i] = (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[4] & 1;
	}

	/* issue bank reset to return to read mode */
	addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xF0F0F0F0;
	return info->size;
}

static int wait_for_DQ7_2(flash_info_t * info, int sect)
{
	ulong start, now, last;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr =
	    (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

	start = get_timer(0);
	last = start;
	while (((CONFIG_SYS_FLASH_WORD_SIZE)addr[0] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080) !=
	       (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080) {
		if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
			printf("Timeout\n");
			return -1;
		}
		/* show that we're waiting */
		if ((now - last) > 1000) { /* every second */
			putc('.');
			last = now;
		}
	}
	return 0;
}

static int flash_erase_2(flash_info_t * info, int s_first, int s_last)
{
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;
	int i;

	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;
	}

	if (info->flash_id == FLASH_UNKNOWN) {
		printf("Can't erase unknown flash type - aborted\n");
		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");
	}

	l_sect = -1;

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

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

			if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
				addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
				addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x50505050;	/* block erase */
				for (i = 0; i < 50; i++)
					udelay(1000);	/* wait 1 ms */
			} else {
				addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
				addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
				addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x30303030;	/* sector erase */
			}
			l_sect = sect;
			/*
			 * Wait for each sector to complete, it's more
			 * reliable.  According to AMD Spec, you must
			 * issue all erase commands within a specified
			 * timeout.  This has been seen to fail, especially
			 * if printf()s are included (for debug)!!
			 */
			wait_for_DQ7_2(info, sect);
		}
	}

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

	/* wait at least 80us - let's wait 1 ms */
	udelay(1000);

	/* reset to read mode */
	addr = (CONFIG_SYS_FLASH_WORD_SIZE *) info->start[0];
	addr[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xF0F0F0F0; /* reset bank */

	printf(" done\n");
	return 0;
}

static int write_word_2(flash_info_t * info, ulong dest, ulong data)
{
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE *dest2 = (CONFIG_SYS_FLASH_WORD_SIZE *) dest;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *) & data;
	ulong start;
	int i;

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

	for (i = 0; i < 4 / sizeof(CONFIG_SYS_FLASH_WORD_SIZE); i++) {
		int flag;

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

		addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
		addr2[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
		addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xA0A0A0A0;

		dest2[i] = data2[i];

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

		/* data polling for D7 */
		start = get_timer(0);
		while ((dest2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080) !=
		       (data2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080)) {

			if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
				return 1;
			}
		}
	}

	return 0;
}

#endif /* FLASH_BASE1_PRELIM */