board/w7o/flash.c - uboot/armada - Git at Google

 /*
  * (C) Copyright 2001
  * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
  *  Based on code by:
  * 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
  */

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

 #include <watchdog.h>

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

 /*
  * Functions
  */
 static ulong flash_get_size(vu_long *addr, flash_info_t *info);
 static int write_word8(flash_info_t *info, ulong dest, ulong data);
 static int write_word32(flash_info_t *info, ulong dest, ulong data);
 static void flash_get_offsets(ulong base, flash_info_t *info);

 unsigned long flash_init(void)
 {
 	int i;
 	unsigned long size_b0, base_b0;
 	unsigned long size_b1;

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

 	/* Get Size of Boot and Main Flashes */
 	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);
 		return 0;
 	}
 	size_b1 =
 		flash_get_size((vu_long *) FLASH_BASE1_PRELIM,
 			       &flash_info[1]);
 	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);
 		return 0;
 	}

 	/* Calculate base addresses */
 	base_b0 = -size_b0;

 	/* Setup offsets for Boot Flash */
 	flash_get_offsets(base_b0, &flash_info[0]);

 	/* Protect board level data */
 	(void) flash_protect(FLAG_PROTECT_SET,
 			     base_b0,
 			     flash_info[0].start[1] - 1, &flash_info[0]);

 	/* Monitor protection ON by default */
 	(void) flash_protect(FLAG_PROTECT_SET,
 			     base_b0 + size_b0 - monitor_flash_len,
 			     base_b0 + size_b0 - 1, &flash_info[0]);

 	/* Protect the FPGA image */
 	(void) flash_protect(FLAG_PROTECT_SET,
 			     FLASH_BASE1_PRELIM,
 			     FLASH_BASE1_PRELIM + CONFIG_SYS_FPGA_IMAGE_LEN -
 			     1, &flash_info[1]);

 	/* Protect the default boot image */
 	(void) flash_protect(FLAG_PROTECT_SET,
 			     FLASH_BASE1_PRELIM + CONFIG_SYS_FPGA_IMAGE_LEN,
 			     FLASH_BASE1_PRELIM + CONFIG_SYS_FPGA_IMAGE_LEN +
 			     0x600000 - 1, &flash_info[1]);

 	/* Setup offsets for Main Flash */
 	flash_get_offsets(FLASH_BASE1_PRELIM, &flash_info[1]);

 	return size_b0 + size_b1;
 }

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

 	/* set up sector start address table - FOR BOOT ROM ONLY!!! */
 	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
 		for (i = 0; i < info->sector_count; i++)
 			info->start[i] = base + (i * 0x00010000);
 	}
 }				/* end flash_get_offsets() */

 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("1 x AMD ");
 		break;
 	case FLASH_MAN_STM:
 		printf("1 x STM ");
 		break;
 	case FLASH_MAN_INTEL:
 		printf("2 x Intel ");
 		break;
 	default:
 		printf("Unknown Vendor ");
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM040:
 		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
 			printf("AM29LV040 (4096 Kbit, uniform sector size)\n");
 		else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_STM)
 			printf("M29W040B (4096 Kbit, uniform block size)\n");
 		else
 			printf("UNKNOWN 29x040x (4096 Kbit, uniform sector size)\n");
 		break;
 	case FLASH_28F320J3A:
 		printf("28F320J3A (32 Mbit = 128K x 32)\n");
 		break;
 	case FLASH_28F640J3A:
 		printf("28F640J3A (64 Mbit = 128K x 64)\n");
 		break;
 	case FLASH_28F128J3A:
 		printf("28F128J3A (128 Mbit = 128K x 128)\n");
 		break;
 	default:
 		printf("Unknown Chip Type\n");
 	}

 	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_STM) {
 		printf("  Size: %ld KB in %d Blocks\n",
 		       info->size >> 10, info->sector_count);
 	} else {
 		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");
 }				/* end flash_print_info() */

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

 	/* Setup default type */
 	info->flash_id = FLASH_UNKNOWN;
 	info->sector_count = 0;
 	info->size = 0;

 	/* Test for Boot Flash */
 	if (base == FLASH_BASE0_PRELIM) {
 		unsigned char value;
 		volatile unsigned char *addr2 = (unsigned char *) addr;

 		/* Write auto select command: read Manufacturer ID */
 		*(addr2 + 0x555) = 0xaa;
 		*(addr2 + 0x2aa) = 0x55;
 		*(addr2 + 0x555) = 0x90;

 		/* Manufacture ID */
 		value = *addr2;
 		switch (value) {
 		case (unsigned char) AMD_MANUFACT:
 			info->flash_id = FLASH_MAN_AMD;
 			break;
 		case (unsigned char) STM_MANUFACT:
 			info->flash_id = FLASH_MAN_STM;
 			break;
 		default:
 			*addr2 = 0xf0;	/* no or unknown flash  */
 			return 0;
 		}

 		/* Device ID */
 		value = *(addr2 + 1);
 		switch (value) {
 		case (unsigned char) AMD_ID_LV040B:
 		case (unsigned char) STM_ID_29W040B:
 			info->flash_id += FLASH_AM040;
 			info->sector_count = 8;
 			info->size = 0x00080000;
 			break;	/* => 512Kb */
 		default:
 			*addr2 = 0xf0;	/* => no or unknown flash */
 			return 0;
 		}
 	} else {		/* MAIN Flash */
 		unsigned long value;
 		volatile unsigned long *addr2 = (unsigned long *) addr;

 		/* Write auto select command: read Manufacturer ID */
 		*addr2 = 0x90909090;

 		/* Manufacture ID */
 		value = *addr2;
 		switch (value) {
 		case (unsigned long) INTEL_MANUFACT:
 			info->flash_id = FLASH_MAN_INTEL;
 			break;
 		default:
 			*addr2 = 0xff;	/* no or unknown flash  */
 			return 0;
 		}

 		/* Device ID - This shit is interleaved... */
 		value = *(addr2 + 1);
 		switch (value) {
 		case (unsigned long) INTEL_ID_28F320J3A:
 			info->flash_id += FLASH_28F320J3A;
 			info->sector_count = 32;
 			info->size = 0x00400000 * 2;
 			break;	/* => 2 X 4 MB */
 		case (unsigned long) INTEL_ID_28F640J3A:
 			info->flash_id += FLASH_28F640J3A;
 			info->sector_count = 64;
 			info->size = 0x00800000 * 2;
 			break;	/* => 2 X 8 MB */
 		case (unsigned long) INTEL_ID_28F128J3A:
 			info->flash_id += FLASH_28F128J3A;
 			info->sector_count = 128;
 			info->size = 0x01000000 * 2;
 			break;	/* => 2 X 16 MB */
 		default:
 			*addr2 = 0xff;	/* => no or unknown flash */
 		}
 	}

 	/* Make sure we don't exceed CONFIG_SYS_MAX_FLASH_SECT */
 	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
 		printf("** ERROR: sector count %d > max (%d) **\n",
 		       info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
 		info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 	}

 	/* set up sector start address table */
 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM040:
 		for (i = 0; i < info->sector_count; i++)
 			info->start[i] = base + (i * 0x00010000);
 		break;
 	case FLASH_28F320J3A:
 	case FLASH_28F640J3A:
 	case FLASH_28F128J3A:
 		for (i = 0; i < info->sector_count; i++)
 			info->start[i] = base +
 					(i * 0x00020000 * 2);	/* 2 Banks */
 		break;
 	}

 	/* Test for Boot Flash */
 	if (base == FLASH_BASE0_PRELIM) {
 		volatile unsigned char *addr2;

 		/* check for protected sectors */
 		for (i = 0; i < info->sector_count; i++) {
 			/*
 			 * read sector protection at sector address,
 			 * (AX .. A0) = 0x02
 			 * D0 = 1 if protected
 			 */
 			addr2 = (volatile unsigned char *) (info->start[i]);
 			info->protect[i] = *(addr2 + 2) & 1;
 		}

 		/* Restore read mode */
 		*(unsigned char *) base = 0xF0;	/* Reset NORMAL Flash */
 	} else {		/* Main Flash */
 		volatile unsigned long *addr2;

 		/* check for protected sectors */
 		for (i = 0; i < info->sector_count; i++) {
 			/*
 			 * read sector protection at sector address,
 			 * (AX .. A0) = 0x02
 			 * D0 = 1 if protected
 			 */
 			addr2 = (volatile unsigned long *) (info->start[i]);
 			info->protect[i] = *(addr2 + 2) & 0x1;
 		}

 		/* Restore read mode */
 		*(unsigned long *) base = 0xFFFFFFFF;	/* Reset  Flash */
 	}

 	return info->size;
 }				/* end flash_get_size() */

 static int wait_for_DQ7(ulong addr, uchar cmp_val, ulong tout)
 {
 	int i;

 	volatile uchar *vaddr = (uchar *) addr;

 	/* Loop X times */
 	for (i = 1; i <= (100 * tout); i++) {	/* Wait up to tout ms */
 		udelay(10);
 		/* Pause 10 us */

 		/* Check for completion */
 		if ((vaddr[0] & 0x80) == (cmp_val & 0x80))
 			return 0;

 		/* KEEP THE LUSER HAPPY - Print a dot every 1.1 seconds */
 		if (!(i % 110000))
 			putc('.');

 		/* Kick the dog if needed */
 		WATCHDOG_RESET();
 	}

 	return 1;
 }				/* wait_for_DQ7() */

 static int flash_erase8(flash_info_t *info, int s_first, int s_last)
 {
 	int tcode, rcode = 0;
 	volatile uchar *addr = (uchar *) (info->start[0]);
 	volatile uchar *sector_addr;
 	int flag, prot, sect;

 	/* Validate arguments */
 	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;
 	}

 	/* Check for KNOWN flash type */
 	if (info->flash_id == FLASH_UNKNOWN) {
 		printf("Can't erase unknown flash type - aborted\n");
 		return 1;
 	}

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

 			if ((info->flash_id & FLASH_VENDMASK) ==
 			    FLASH_MAN_STM)
 				printf("Erasing block %p\n", sector_addr);
 			else
 				printf("Erasing sector %p\n", sector_addr);

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

 			*(addr + 0x555) = (uchar) 0xAA;
 			*(addr + 0x2aa) = (uchar) 0x55;
 			*(addr + 0x555) = (uchar) 0x80;
 			*(addr + 0x555) = (uchar) 0xAA;
 			*(addr + 0x2aa) = (uchar) 0x55;
 			*sector_addr = (uchar) 0x30;	/* sector erase */

 			/*
 			 * 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)!!
 			 * Takes up to 6 seconds.
 			 */
 			tcode = wait_for_DQ7((ulong) sector_addr, 0x80, 6000);

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

 			/* Make sure we didn't timeout */
 			if (tcode) {
 				printf("Timeout\n");
 				rcode = 1;
 			}
 		}
 	}

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

 	/* reset to read mode */
 	addr = (uchar *) info->start[0];
 	*addr = (uchar) 0xF0;	/* reset bank */

 	printf(" done\n");
 	return rcode;
 }				/* end flash_erase8() */

 static int flash_erase32(flash_info_t *info, int s_first, int s_last)
 {
 	int flag, sect;
 	ulong start, now, last;
 	int prot = 0;

 	/* Validate arguments */
 	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;
 	}

 	/* Check for KNOWN flash type */
 	if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
 		printf("Can erase only Intel flash types - aborted\n");
 		return 1;
 	}

 	/* Check for protected sectors */
 	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; sect++) {
 		WATCHDOG_RESET();
 		if (info->protect[sect] == 0) {	/* not protected */
 			vu_long *addr = (vu_long *) (info->start[sect]);
 			unsigned long status;

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

 			*addr = 0x00500050;	/* clear status register */
 			*addr = 0x00200020;	/* erase setup */
 			*addr = 0x00D000D0;	/* erase confirm */

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

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

 			while (((status = *addr) & 0x00800080) != 0x00800080) {
 				now = get_timer(start);
 				if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
 					printf("Timeout\n");
 					/* suspend erase      */
 					*addr = 0x00B000B0;
 					/* reset to read mode */
 					*addr = 0x00FF00FF;
 					return 1;
 				}

 				/*
 				 * show that we're waiting
 				 * every second (?)
 				 */
 				if ((now - last) > 990) {
 					putc('.');
 					last = now;
 				}
 			}
 			*addr = 0x00FF00FF;	/* reset to read mode */
 		}
 	}
 	printf(" done\n");
 	return 0;
 }

 int flash_erase(flash_info_t *info, int s_first, int s_last)
 {
 	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
 		return flash_erase8(info, s_first, s_last);
 	else
 		return flash_erase32(info, s_first, s_last);
 }

 /*
  * Copy memory to flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_buff8(flash_info_t *info, uchar *src, ulong addr,
 		       ulong cnt)
 {
 	ulong cp, wp, data;
 	ulong start;
 	int i, l, rc;

 	start = get_timer(0);

 	wp = (addr & ~3);	/* get lower word
 				   aligned address */

 	/*
 	 * handle unaligned start bytes
 	 */
 	l = addr - wp;
 	if (l != 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);

 		rc = write_word8(info, wp, data);
 		if (rc != 0)
 			return rc;

 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		data = 0;
 		for (i = 0; i < 4; ++i)
 			data = (data << 8) | *src++;

 		rc = write_word8(info, wp, data);
 		if (rc != 0)
 			return rc;

 		wp += 4;
 		cnt -= 4;
 		if (get_timer(start) > 1000) {	/* every second */
 			WATCHDOG_RESET();
 			putc('.');
 			start = get_timer(0);
 		}
 	}

 	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_word8(info, wp, data);
 }

 #define	FLASH_WIDTH	4	/* flash bus width in bytes */
 static int write_buff32(flash_info_t *info, uchar *src, ulong addr,
 			ulong cnt)
 {
 	ulong cp, wp, data;
 	int i, l, rc;
 	ulong start;

 	start = get_timer(0);

 	if (info->flash_id == FLASH_UNKNOWN)
 		return 4;

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

 	/*
 	 * 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 < FLASH_WIDTH && cnt > 0; ++i) {
 			data = (data << 8) | *src++;
 			--cnt;
 			++cp;
 		}

 		for (; cnt == 0 && i < FLASH_WIDTH; ++i, ++cp)
 			data = (data << 8) | (*(uchar *) cp);

 		rc = write_word32(info, wp, data);
 		if (rc != 0)
 			return rc;

 		wp += FLASH_WIDTH;
 	}

 	/*
 	 * handle FLASH_WIDTH aligned part
 	 */
 	while (cnt >= FLASH_WIDTH) {
 		data = 0;
 		for (i = 0; i < FLASH_WIDTH; ++i)
 			data = (data << 8) | *src++;

 		rc = write_word32(info, wp, data);
 		if (rc != 0)
 			return rc;

 		wp += FLASH_WIDTH;
 		cnt -= FLASH_WIDTH;
 		if (get_timer(start) > 990) {	/* every second */
 			putc('.');
 			start = get_timer(0);
 		}
 	}

 	if (cnt == 0)
 		return 0;

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

 	for (; i < FLASH_WIDTH; ++i, ++cp)
 		data = (data << 8) | (*(uchar *) cp);

 	return write_word32(info, wp, data);
 }

 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 {
 	int retval;

 	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
 		retval = write_buff8(info, src, addr, cnt);
 	else
 		retval = write_buff32(info, src, addr, cnt);

 	return retval;
 }

 /*
  * Write a word to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */

 static int write_word8(flash_info_t *info, ulong dest, ulong data)
 {
 	volatile uchar *addr2 = (uchar *) (info->start[0]);
 	volatile uchar *dest2 = (uchar *) dest;
 	volatile uchar *data2 = (uchar *) &data;
 	int flag;
 	int i, tcode, rcode = 0;

 	/* Check if Flash is (sufficently) erased */
 	if ((*((volatile uchar *)dest) & (uchar)data) != (uchar)data)
 		return 2;

 	for (i = 0; i < (4 / sizeof(uchar)); i++) {
 		/* Disable interrupts which might cause a timeout here */
 		flag = disable_interrupts();

 		*(addr2 + 0x555) = (uchar) 0xAA;
 		*(addr2 + 0x2aa) = (uchar) 0x55;
 		*(addr2 + 0x555) = (uchar) 0xA0;

 		dest2[i] = data2[i];

 		/* Wait for write to complete, up to 1ms */
 		tcode = wait_for_DQ7((ulong) &dest2[i], data2[i], 1);

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

 		/* Make sure we didn't timeout */
 		if (tcode)
 			rcode = 1;
 	}

 	return rcode;
 }

 static int write_word32(flash_info_t *info, ulong dest, ulong data)
 {
 	vu_long *addr = (vu_long *) dest;
 	ulong status;
 	ulong start;
 	int flag;

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

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

 	*addr = 0x00400040;	/* write setup */
 	*addr = data;

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

 	start = get_timer(0);

 	while (((status = *addr) & 0x00800080) != 0x00800080) {
 		WATCHDOG_RESET();
 		if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 			*addr = 0x00FF00FF;	/* restore read mode */
 			return 1;
 		}
 	}

 	*addr = 0x00FF00FF;	/* restore read mode */

 	return 0;
 }

 static int _flash_protect(flash_info_t *info, long sector)
 {
 	int i;
 	int flag;
 	ulong status;
 	int rcode = 0;
 	volatile long *addr = (long *)sector;

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_28F320J3A:
 	case FLASH_28F640J3A:
 	case FLASH_28F128J3A:
 		/* Disable interrupts which might cause Flash to timeout */
 		flag = disable_interrupts();

 		/* Issue command */
 		*addr = 0x00500050L;	/* Clear the status register */
 		*addr = 0x00600060L;	/* Set lock bit setup */
 		*addr = 0x00010001L;	/* Set lock bit confirm */

 		/* Wait for command completion */
 		for (i = 0; i < 10; i++) {	/* 75us timeout, wait 100us */
 			udelay(10);
 			if ((*addr & 0x00800080L) == 0x00800080L)
 				break;
 		}

 		/* Not successful? */
 		status = *addr;
 		if (status != 0x00800080L) {
 			printf("Protect %x sector failed: %x\n",
 			       (uint) sector, (uint) status);
 			rcode = 1;
 		}

 		/* Restore read mode */
 		*addr = 0x00ff00ffL;

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

 		break;
 	case FLASH_AM040:	/* No soft sector protection */
 		break;
 	}

 	/* Turn protection on for this sector */
 	for (i = 0; i < info->sector_count; i++) {
 		if (info->start[i] == sector) {
 			info->protect[i] = 1;
 			break;
 		}
 	}

 	return rcode;
 }

 static int _flash_unprotect(flash_info_t *info, long sector)
 {
 	int i;
 	int flag;
 	ulong status;
 	int rcode = 0;
 	volatile long *addr = (long *) sector;

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_28F320J3A:
 	case FLASH_28F640J3A:
 	case FLASH_28F128J3A:
 		/* Disable interrupts which might cause Flash to timeout */
 		flag = disable_interrupts();

 		*addr = 0x00500050L;	/* Clear the status register */
 		*addr = 0x00600060L;	/* Clear lock bit setup */
 		*addr = 0x00D000D0L;	/* Clear lock bit confirm */

 		/* Wait for command completion */
 		for (i = 0; i < 80; i++) {	/* 700ms timeout, wait 800 */
 			udelay(10000);	/* Delay 10ms */
 			if ((*addr & 0x00800080L) == 0x00800080L)
 				break;
 		}

 		/* Not successful? */
 		status = *addr;
 		if (status != 0x00800080L) {
 			printf("Un-protect %x sector failed: %x\n",
 			       (uint) sector, (uint) status);
 			*addr = 0x00ff00ffL;
 			rcode = 1;
 		}

 		/* restore read mode */
 		*addr = 0x00ff00ffL;

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

 		break;
 	case FLASH_AM040:	/* No soft sector protection */
 		break;
 	}

 	/*
 	 * Fix Intel's little red wagon.  Reprotect
 	 * sectors that were protected before we undid
 	 * protection on a specific sector.
 	 */
 	for (i = 0; i < info->sector_count; i++) {
 		if (info->start[i] != sector) {
 			if (info->protect[i]) {
 				if (_flash_protect(info, info->start[i]))
 					rcode = 1;
 			}
 		} else		/* Turn protection off for this sector */
 			info->protect[i] = 0;
 	}

 	return rcode;
 }

 int flash_real_protect(flash_info_t *info, long sector, int prot)
 {
 	int rcode;

 	if (prot)
 		rcode = _flash_protect(info, info->start[sector]);
 	else
 		rcode = _flash_unprotect(info, info->start[sector]);

 	return rcode;
 }
	/*
	* (C) Copyright 2001
	* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
	* Based on code by:
	* 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
	*/

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

	#include <watchdog.h>

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

	/*
	* Functions
	*/
	static ulong flash_get_size(vu_long addr, flash_info_t info);
	static int write_word8(flash_info_t *info, ulong dest, ulong data);
	static int write_word32(flash_info_t *info, ulong dest, ulong data);
	static void flash_get_offsets(ulong base, flash_info_t *info);

	unsigned long flash_init(void)
	{
	int i;
	unsigned long size_b0, base_b0;
	unsigned long size_b1;

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

	/* Get Size of Boot and Main Flashes */
	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);
	return 0;
	}
	size_b1 =
	flash_get_size((vu_long *) FLASH_BASE1_PRELIM,
	&flash_info[1]);
	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);
	return 0;
	}

	/* Calculate base addresses */
	base_b0 = -size_b0;

	/* Setup offsets for Boot Flash */
	flash_get_offsets(base_b0, &flash_info[0]);

	/* Protect board level data */
	(void) flash_protect(FLAG_PROTECT_SET,
	base_b0,
	flash_info[0].start[1] - 1, &flash_info[0]);

	/* Monitor protection ON by default */
	(void) flash_protect(FLAG_PROTECT_SET,
	base_b0 + size_b0 - monitor_flash_len,
	base_b0 + size_b0 - 1, &flash_info[0]);

	/* Protect the FPGA image */
	(void) flash_protect(FLAG_PROTECT_SET,
	FLASH_BASE1_PRELIM,
	FLASH_BASE1_PRELIM + CONFIG_SYS_FPGA_IMAGE_LEN -
	1, &flash_info[1]);

	/* Protect the default boot image */
	(void) flash_protect(FLAG_PROTECT_SET,
	FLASH_BASE1_PRELIM + CONFIG_SYS_FPGA_IMAGE_LEN,
	FLASH_BASE1_PRELIM + CONFIG_SYS_FPGA_IMAGE_LEN +
	0x600000 - 1, &flash_info[1]);

	/* Setup offsets for Main Flash */
	flash_get_offsets(FLASH_BASE1_PRELIM, &flash_info[1]);

	return size_b0 + size_b1;
	}

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

	/* set up sector start address table - FOR BOOT ROM ONLY!!! */
	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * 0x00010000);
	}
	} /* end flash_get_offsets() */

	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("1 x AMD ");
	break;
	case FLASH_MAN_STM:
	printf("1 x STM ");
	break;
	case FLASH_MAN_INTEL:
	printf("2 x Intel ");
	break;
	default:
	printf("Unknown Vendor ");
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
	printf("AM29LV040 (4096 Kbit, uniform sector size)\n");
	else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_STM)
	printf("M29W040B (4096 Kbit, uniform block size)\n");
	else
	printf("UNKNOWN 29x040x (4096 Kbit, uniform sector size)\n");
	break;
	case FLASH_28F320J3A:
	printf("28F320J3A (32 Mbit = 128K x 32)\n");
	break;
	case FLASH_28F640J3A:
	printf("28F640J3A (64 Mbit = 128K x 64)\n");
	break;
	case FLASH_28F128J3A:
	printf("28F128J3A (128 Mbit = 128K x 128)\n");
	break;
	default:
	printf("Unknown Chip Type\n");
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_STM) {
	printf(" Size: %ld KB in %d Blocks\n",
	info->size >> 10, info->sector_count);
	} else {
	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");
	} /* end flash_print_info() */

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

	/* Setup default type */
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;

	/* Test for Boot Flash */
	if (base == FLASH_BASE0_PRELIM) {
	unsigned char value;
	volatile unsigned char addr2 = (unsigned char ) addr;

	/* Write auto select command: read Manufacturer ID */
	*(addr2 + 0x555) = 0xaa;
	*(addr2 + 0x2aa) = 0x55;
	*(addr2 + 0x555) = 0x90;

	/* Manufacture ID */
	value = *addr2;
	switch (value) {
	case (unsigned char) AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
	case (unsigned char) STM_MANUFACT:
	info->flash_id = FLASH_MAN_STM;
	break;
	default:
	addr2 = 0xf0; / no or unknown flash */
	return 0;
	}

	/* Device ID */
	value = *(addr2 + 1);
	switch (value) {
	case (unsigned char) AMD_ID_LV040B:
	case (unsigned char) STM_ID_29W040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x00080000;
	break; /* => 512Kb */
	default:
	addr2 = 0xf0; / => no or unknown flash */
	return 0;
	}
	} else { /* MAIN Flash */
	unsigned long value;
	volatile unsigned long addr2 = (unsigned long ) addr;

	/* Write auto select command: read Manufacturer ID */
	*addr2 = 0x90909090;

	/* Manufacture ID */
	value = *addr2;
	switch (value) {
	case (unsigned long) INTEL_MANUFACT:
	info->flash_id = FLASH_MAN_INTEL;
	break;
	default:
	addr2 = 0xff; / no or unknown flash */
	return 0;
	}

	/* Device ID - This shit is interleaved... */
	value = *(addr2 + 1);
	switch (value) {
	case (unsigned long) INTEL_ID_28F320J3A:
	info->flash_id += FLASH_28F320J3A;
	info->sector_count = 32;
	info->size = 0x00400000 * 2;
	break; /* => 2 X 4 MB */
	case (unsigned long) INTEL_ID_28F640J3A:
	info->flash_id += FLASH_28F640J3A;
	info->sector_count = 64;
	info->size = 0x00800000 * 2;
	break; /* => 2 X 8 MB */
	case (unsigned long) INTEL_ID_28F128J3A:
	info->flash_id += FLASH_28F128J3A;
	info->sector_count = 128;
	info->size = 0x01000000 * 2;
	break; /* => 2 X 16 MB */
	default:
	addr2 = 0xff; / => no or unknown flash */
	}
	}

	/* Make sure we don't exceed CONFIG_SYS_MAX_FLASH_SECT */
	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
	printf(" ERROR: sector count %d > max (%d) \n",
	info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
	info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
	}

	/* set up sector start address table */
	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * 0x00010000);
	break;
	case FLASH_28F320J3A:
	case FLASH_28F640J3A:
	case FLASH_28F128J3A:
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base +
	(i * 0x00020000 * 2); /* 2 Banks */
	break;
	}

	/* Test for Boot Flash */
	if (base == FLASH_BASE0_PRELIM) {
	volatile unsigned char *addr2;

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
	/*
	* read sector protection at sector address,
	* (AX .. A0) = 0x02
	* D0 = 1 if protected
	*/
	addr2 = (volatile unsigned char *) (info->start[i]);
	info->protect[i] = *(addr2 + 2) & 1;
	}

	/* Restore read mode */
	(unsigned char ) base = 0xF0; /* Reset NORMAL Flash */
	} else { /* Main Flash */
	volatile unsigned long *addr2;

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
	/*
	* read sector protection at sector address,
	* (AX .. A0) = 0x02
	* D0 = 1 if protected
	*/
	addr2 = (volatile unsigned long *) (info->start[i]);
	info->protect[i] = *(addr2 + 2) & 0x1;
	}

	/* Restore read mode */
	(unsigned long ) base = 0xFFFFFFFF; /* Reset Flash */
	}

	return info->size;
	} /* end flash_get_size() */

	static int wait_for_DQ7(ulong addr, uchar cmp_val, ulong tout)
	{
	int i;

	volatile uchar vaddr = (uchar ) addr;

	/* Loop X times */
	for (i = 1; i <= (100 * tout); i++) { /* Wait up to tout ms */
	udelay(10);
	/* Pause 10 us */

	/* Check for completion */
	if ((vaddr[0] & 0x80) == (cmp_val & 0x80))
	return 0;

	/* KEEP THE LUSER HAPPY - Print a dot every 1.1 seconds */
	if (!(i % 110000))
	putc('.');

	/* Kick the dog if needed */
	WATCHDOG_RESET();
	}

	return 1;
	} /* wait_for_DQ7() */

	static int flash_erase8(flash_info_t *info, int s_first, int s_last)
	{
	int tcode, rcode = 0;
	volatile uchar addr = (uchar ) (info->start[0]);
	volatile uchar *sector_addr;
	int flag, prot, sect;

	/* Validate arguments */
	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;
	}

	/* Check for KNOWN flash type */
	if (info->flash_id == FLASH_UNKNOWN) {
	printf("Can't erase unknown flash type - aborted\n");
	return 1;
	}

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

	if ((info->flash_id & FLASH_VENDMASK) ==
	FLASH_MAN_STM)
	printf("Erasing block %p\n", sector_addr);
	else
	printf("Erasing sector %p\n", sector_addr);

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

	*(addr + 0x555) = (uchar) 0xAA;
	*(addr + 0x2aa) = (uchar) 0x55;
	*(addr + 0x555) = (uchar) 0x80;
	*(addr + 0x555) = (uchar) 0xAA;
	*(addr + 0x2aa) = (uchar) 0x55;
	sector_addr = (uchar) 0x30; / sector erase */

	/*
	* 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)!!
	* Takes up to 6 seconds.
	*/
	tcode = wait_for_DQ7((ulong) sector_addr, 0x80, 6000);

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

	/* Make sure we didn't timeout */
	if (tcode) {
	printf("Timeout\n");
	rcode = 1;
	}
	}
	}

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

	/* reset to read mode */
	addr = (uchar *) info->start[0];
	addr = (uchar) 0xF0; / reset bank */

	printf(" done\n");
	return rcode;
	} /* end flash_erase8() */

	static int flash_erase32(flash_info_t *info, int s_first, int s_last)
	{
	int flag, sect;
	ulong start, now, last;
	int prot = 0;

	/* Validate arguments */
	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;
	}

	/* Check for KNOWN flash type */
	if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
	printf("Can erase only Intel flash types - aborted\n");
	return 1;
	}

	/* Check for protected sectors */
	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; sect++) {
	WATCHDOG_RESET();
	if (info->protect[sect] == 0) { /* not protected */
	vu_long addr = (vu_long ) (info->start[sect]);
	unsigned long status;

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

	addr = 0x00500050; / clear status register */
	addr = 0x00200020; / erase setup */
	addr = 0x00D000D0; / erase confirm */

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

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

	while (((status = *addr) & 0x00800080) != 0x00800080) {
	now = get_timer(start);
	if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf("Timeout\n");
	/* suspend erase */
	*addr = 0x00B000B0;
	/* reset to read mode */
	*addr = 0x00FF00FF;
	return 1;
	}

	/*
	* show that we're waiting
	* every second (?)
	*/
	if ((now - last) > 990) {
	putc('.');
	last = now;
	}
	}
	addr = 0x00FF00FF; / reset to read mode */
	}
	}
	printf(" done\n");
	return 0;
	}

	int flash_erase(flash_info_t *info, int s_first, int s_last)
	{
	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
	return flash_erase8(info, s_first, s_last);
	else
	return flash_erase32(info, s_first, s_last);
	}

	/*
	* Copy memory to flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_buff8(flash_info_t info, uchar src, ulong addr,
	ulong cnt)
	{
	ulong cp, wp, data;
	ulong start;
	int i, l, rc;

	start = get_timer(0);

	wp = (addr & ~3); /* get lower word
	aligned address */

	/*
	* handle unaligned start bytes
	*/
	l = addr - wp;
	if (l != 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);

	rc = write_word8(info, wp, data);
	if (rc != 0)
	return rc;

	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = 0;
	for (i = 0; i < 4; ++i)
	data = (data << 8) \| *src++;

	rc = write_word8(info, wp, data);
	if (rc != 0)
	return rc;

	wp += 4;
	cnt -= 4;
	if (get_timer(start) > 1000) { /* every second */
	WATCHDOG_RESET();
	putc('.');
	start = get_timer(0);
	}
	}

	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_word8(info, wp, data);
	}

	#define FLASH_WIDTH 4 /* flash bus width in bytes */
	static int write_buff32(flash_info_t info, uchar src, ulong addr,
	ulong cnt)
	{
	ulong cp, wp, data;
	int i, l, rc;
	ulong start;

	start = get_timer(0);

	if (info->flash_id == FLASH_UNKNOWN)
	return 4;

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

	/*
	* 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 < FLASH_WIDTH && cnt > 0; ++i) {
	data = (data << 8) \| *src++;
	--cnt;
	++cp;
	}

	for (; cnt == 0 && i < FLASH_WIDTH; ++i, ++cp)
	data = (data << 8) \| ((uchar ) cp);

	rc = write_word32(info, wp, data);
	if (rc != 0)
	return rc;

	wp += FLASH_WIDTH;
	}

	/*
	* handle FLASH_WIDTH aligned part
	*/
	while (cnt >= FLASH_WIDTH) {
	data = 0;
	for (i = 0; i < FLASH_WIDTH; ++i)
	data = (data << 8) \| *src++;

	rc = write_word32(info, wp, data);
	if (rc != 0)
	return rc;

	wp += FLASH_WIDTH;
	cnt -= FLASH_WIDTH;
	if (get_timer(start) > 990) { /* every second */
	putc('.');
	start = get_timer(0);
	}
	}

	if (cnt == 0)
	return 0;

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

	for (; i < FLASH_WIDTH; ++i, ++cp)
	data = (data << 8) \| ((uchar ) cp);

	return write_word32(info, wp, data);
	}

	int write_buff(flash_info_t info, uchar src, ulong addr, ulong cnt)
	{
	int retval;

	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
	retval = write_buff8(info, src, addr, cnt);
	else
	retval = write_buff32(info, src, addr, cnt);

	return retval;
	}

	/*
	* Write a word to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/

	static int write_word8(flash_info_t *info, ulong dest, ulong data)
	{
	volatile uchar addr2 = (uchar ) (info->start[0]);
	volatile uchar dest2 = (uchar ) dest;
	volatile uchar data2 = (uchar ) &data;
	int flag;
	int i, tcode, rcode = 0;

	/* Check if Flash is (sufficently) erased */
	if ((((volatile uchar )dest) & (uchar)data) != (uchar)data)
	return 2;

	for (i = 0; i < (4 / sizeof(uchar)); i++) {
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	*(addr2 + 0x555) = (uchar) 0xAA;
	*(addr2 + 0x2aa) = (uchar) 0x55;
	*(addr2 + 0x555) = (uchar) 0xA0;

	dest2[i] = data2[i];

	/* Wait for write to complete, up to 1ms */
	tcode = wait_for_DQ7((ulong) &dest2[i], data2[i], 1);

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

	/* Make sure we didn't timeout */
	if (tcode)
	rcode = 1;
	}

	return rcode;
	}

	static int write_word32(flash_info_t *info, ulong dest, ulong data)
	{
	vu_long addr = (vu_long ) dest;
	ulong status;
	ulong start;
	int flag;

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

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

	addr = 0x00400040; / write setup */
	*addr = data;

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

	start = get_timer(0);

	while (((status = *addr) & 0x00800080) != 0x00800080) {
	WATCHDOG_RESET();
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	addr = 0x00FF00FF; / restore read mode */
	return 1;
	}
	}

	addr = 0x00FF00FF; / restore read mode */

	return 0;
	}

	static int _flash_protect(flash_info_t *info, long sector)
	{
	int i;
	int flag;
	ulong status;
	int rcode = 0;
	volatile long addr = (long )sector;

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F320J3A:
	case FLASH_28F640J3A:
	case FLASH_28F128J3A:
	/* Disable interrupts which might cause Flash to timeout */
	flag = disable_interrupts();

	/* Issue command */
	addr = 0x00500050L; / Clear the status register */
	addr = 0x00600060L; / Set lock bit setup */
	addr = 0x00010001L; / Set lock bit confirm */

	/* Wait for command completion */
	for (i = 0; i < 10; i++) { /* 75us timeout, wait 100us */
	udelay(10);
	if ((*addr & 0x00800080L) == 0x00800080L)
	break;
	}

	/* Not successful? */
	status = *addr;
	if (status != 0x00800080L) {
	printf("Protect %x sector failed: %x\n",
	(uint) sector, (uint) status);
	rcode = 1;
	}

	/* Restore read mode */
	*addr = 0x00ff00ffL;

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

	break;
	case FLASH_AM040: /* No soft sector protection */
	break;
	}

	/* Turn protection on for this sector */
	for (i = 0; i < info->sector_count; i++) {
	if (info->start[i] == sector) {
	info->protect[i] = 1;
	break;
	}
	}

	return rcode;
	}

	static int _flash_unprotect(flash_info_t *info, long sector)
	{
	int i;
	int flag;
	ulong status;
	int rcode = 0;
	volatile long addr = (long ) sector;

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F320J3A:
	case FLASH_28F640J3A:
	case FLASH_28F128J3A:
	/* Disable interrupts which might cause Flash to timeout */
	flag = disable_interrupts();

	addr = 0x00500050L; / Clear the status register */
	addr = 0x00600060L; / Clear lock bit setup */
	addr = 0x00D000D0L; / Clear lock bit confirm */

	/* Wait for command completion */
	for (i = 0; i < 80; i++) { /* 700ms timeout, wait 800 */
	udelay(10000); /* Delay 10ms */
	if ((*addr & 0x00800080L) == 0x00800080L)
	break;
	}

	/* Not successful? */
	status = *addr;
	if (status != 0x00800080L) {
	printf("Un-protect %x sector failed: %x\n",
	(uint) sector, (uint) status);
	*addr = 0x00ff00ffL;
	rcode = 1;
	}

	/* restore read mode */
	*addr = 0x00ff00ffL;

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

	break;
	case FLASH_AM040: /* No soft sector protection */
	break;
	}

	/*
	* Fix Intel's little red wagon. Reprotect
	* sectors that were protected before we undid
	* protection on a specific sector.
	*/
	for (i = 0; i < info->sector_count; i++) {
	if (info->start[i] != sector) {
	if (info->protect[i]) {
	if (_flash_protect(info, info->start[i]))
	rcode = 1;
	}
	} else /* Turn protection off for this sector */
	info->protect[i] = 0;
	}

	return rcode;
	}

	int flash_real_protect(flash_info_t *info, long sector, int prot)
	{
	int rcode;

	if (prot)
	rcode = _flash_protect(info, info->start[sector]);
	else
	rcode = _flash_unprotect(info, info->start[sector]);

	return rcode;
	}