[J-u-boot.git] / board / etx094 / flash.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <mpc8xx.h>

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

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

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

unsigned long flash_init (void)
{
	volatile immap_t     *immap  = (immap_t *)CONFIG_SYS_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long size_b0, size_b1;
	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);
	}

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

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

	/* Remap FLASH according to real size */
	memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000);
#ifdef CONFIG_FLASH_16BIT
	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V | BR_PS_16; /* 16 Bit data port */
#else
	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;
#endif

	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);

	flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);

#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CONFIG_SYS_MONITOR_BASE,
		      CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
		      &flash_info[0]);
#endif

	if (size_b1) {
		memctl->memc_or1 = CONFIG_SYS_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
#ifdef CONFIG_FLASH_16BIT
		memctl->memc_br1 = ((CONFIG_SYS_FLASH_BASE + size_b0) & BR_BA_MSK) |
				    BR_MS_GPCM | BR_V | BR_PS_16;
#else
		memctl->memc_br1 = ((CONFIG_SYS_FLASH_BASE + size_b0) & BR_BA_MSK) |
				    BR_MS_GPCM | BR_V;
#endif

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

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

#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
		/* monitor protection ON by default */
		flash_protect(FLAG_PROTECT_SET,
			      CONFIG_SYS_MONITOR_BASE,
			      CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
			      &flash_info[1]);
#endif
	} else {
		memctl->memc_br1 = 0;		/* invalidate bank */

		flash_info[1].flash_id = FLASH_UNKNOWN;
		flash_info[1].sector_count = -1;
	}

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

	return (size_b0 + size_b1);
}

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

	if (info->flash_id == FLASH_UNKNOWN) {
		return;
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00002000);
		}
		return;
	}

	/* set up sector start address table */
	if (info->flash_id & FLASH_BTYPE) {
		/* set sector offsets for bottom boot block type	*/
#ifdef CONFIG_FLASH_16BIT
		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
		info->start[0] = base + 0x00000000;
		info->start[1] = base + 0x00008000;
		info->start[2] = base + 0x0000C000;
		info->start[3] = base + 0x00010000;
		for (i = 4; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00020000) - 0x00060000;
#endif
		}
	} else {
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		info->start[i--] = base + info->size - 0x00008000;
		info->start[i--] = base + info->size - 0x0000C000;
		info->start[i--] = base + info->size - 0x00010000;
		for (; i >= 0; i--) {
			info->start[i] = base + i * 0x00020000;
		}
	}

}

/*-----------------------------------------------------------------------
 */
void flash_print_info  (flash_info_t *info)
{
	int i;

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

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

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
				break;
	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
				break;
	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
				break;
	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
				break;
	case FLASH_SST200A:	printf ("39xF200A (2M = 128K x 16)\n");
				break;
	case FLASH_SST400A:	printf ("39xF400A (4M = 256K x 16)\n");
				break;
	case FLASH_SST800A:	printf ("39xF800A (8M = 512K x 16)\n");
				break;
	case FLASH_STM800AB:	printf ("M29W800AB (8M = 512K x 16)\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				break;
	}

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

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
		if ((i % 5) == 0)
			printf ("\n   ");
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     "
		);
	}
	printf ("\n");
	return;
}

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


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

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

static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	ulong value;
	ulong base = (ulong)addr;

	/* Write auto select command: read Manufacturer ID */
#ifdef CONFIG_FLASH_16BIT
	vu_short *s_addr = (vu_short*)addr;
	s_addr[0x5555] = 0x00AA;
	s_addr[0x2AAA] = 0x0055;
	s_addr[0x5555] = 0x0090;
	value = s_addr[0];
	value = value|(value<<16);
#else
	addr[0x5555] = 0x00AA00AA;
	addr[0x2AAA] = 0x00550055;
	addr[0x5555] = 0x00900090;
	value = addr[0];
#endif

	switch (value) {
	case AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	case FUJ_MANUFACT:
		info->flash_id = FLASH_MAN_FUJ;
		break;
	case SST_MANUFACT:
		info->flash_id = FLASH_MAN_SST;
		break;
	case 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	*/
	}
#ifdef CONFIG_FLASH_16BIT
	value = s_addr[1];
	value = value|(value<<16);
#else
	value = addr[1];			/* device ID		*/
#endif

	switch (value) {
	case AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

	case AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
#ifdef CONFIG_FLASH_16BIT
		info->sector_count = 19;
		info->size = 0x00100000;	/* => 1 MB */
#else
		info->sector_count = 19;
		info->size = 0x00200000;	/* => 2 MB	*/
#endif
		break;

	case AMD_ID_LV160T:
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/

	case AMD_ID_LV160B:
		info->flash_id += FLASH_AM160B;
#ifdef CONFIG_FLASH_16BIT
		info->sector_count = 35;
		info->size = 0x00200000;	/* => 2 MB	*/
#else
		info->sector_count = 35;
		info->size = 0x00400000;	/* => 4 MB	*/
#endif

		break;
#if 0	/* enable when device IDs are available */
	case AMD_ID_LV320T:
		info->flash_id += FLASH_AM320T;
		info->sector_count = 67;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/

	case AMD_ID_LV320B:
		info->flash_id += FLASH_AM320B;
		info->sector_count = 67;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/
#endif
	case SST_ID_xF200A:
		info->flash_id += FLASH_SST200A;
		info->sector_count = 64;	/* 39xF200A ID ( 2M = 128K x 16	) */
		info->size = 0x00080000;
		break;
	case SST_ID_xF400A:
		info->flash_id += FLASH_SST400A;
		info->sector_count = 128;	/* 39xF400A ID ( 4M = 256K x 16	) */
		info->size = 0x00100000;
		break;
	case SST_ID_xF800A:
		info->flash_id += FLASH_SST800A;
		info->sector_count = 256;	/* 39xF800A ID ( 8M = 512K x 16	) */
		info->size = 0x00200000;
		break;				/* => 2 MB		*/
	case STM_ID_x800AB:
		info->flash_id += FLASH_STM800AB;
		info->sector_count = 19;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/
	default:
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */

	}

	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;
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00002000);
		}
	} else {	/* AMD and Fujitsu types */
		/* set up sector start address table */
		if (info->flash_id & FLASH_BTYPE) {
			/* set sector offsets for bottom boot block type	*/
#ifdef CONFIG_FLASH_16BIT

			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
			info->start[0] = base + 0x00000000;
			info->start[1] = base + 0x00008000;
			info->start[2] = base + 0x0000C000;
			info->start[3] = base + 0x00010000;
			for (i = 4; i < info->sector_count; i++) {
				info->start[i] = base + (i * 0x00020000) - 0x00060000;
#endif
			}
		} else {
			/* set sector offsets for top boot block type		*/
			i = info->sector_count - 1;
			info->start[i--] = base + info->size - 0x00008000;
			info->start[i--] = base + info->size - 0x0000C000;
			info->start[i--] = base + info->size - 0x00010000;
			for (; i >= 0; i--) {
				info->start[i] = base + i * 0x00020000;
			}
		}

		/* 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
			 */
#ifdef CONFIG_FLASH_16BIT
			s_addr = (volatile unsigned short *)(info->start[i]);
			info->protect[i] = s_addr[2] & 1;
#else
			addr = (volatile unsigned long *)(info->start[i]);
			info->protect[i] = addr[2] & 1;
#endif
		}
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
#ifdef CONFIG_FLASH_16BIT
		s_addr = (volatile unsigned short *)(info->start[0]);
		*s_addr = 0x00F0;	/* reset bank */
#else
		addr = (volatile unsigned long *)info->start[0];
		*addr = 0x00F000F0;	/* reset bank */
#endif

	}
	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	vu_long *addr = (vu_long*)(info->start[0]);
	int flag, prot, sect;
	ulong start, now, last;
#ifdef CONFIG_FLASH_16BIT
	vu_short *s_addr = (vu_short*)addr;
#endif

	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;
	}
/*#ifndef CONFIG_FLASH_16BIT
	ulong type;
	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_SST) && (type != FLASH_MAN_STM)) {
		printf ("Can't erase unknown flash type %08lx - aborted\n",
			info->flash_id);
		return;
	}
#endif*/
	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; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
#ifdef CONFIG_FLASH_16BIT
			vu_short *s_sect_addr = (vu_short*)(info->start[sect]);
#else
			vu_long	*sect_addr = (vu_long*)(info->start[sect]);
#endif
			/* Disable interrupts which might cause a timeout here */
			flag = disable_interrupts();

#ifdef CONFIG_FLASH_16BIT

			/*printf("\ns_sect_addr=%x",s_sect_addr);*/
			s_addr[0x5555] = 0x00AA;
			s_addr[0x2AAA] = 0x0055;
			s_addr[0x5555] = 0x0080;
			s_addr[0x5555] = 0x00AA;
			s_addr[0x2AAA] = 0x0055;
			s_sect_addr[0] = 0x0030;
#else
			addr[0x5555] = 0x00AA00AA;
			addr[0x2AAA] = 0x00550055;
			addr[0x5555] = 0x00800080;
			addr[0x5555] = 0x00AA00AA;
			addr[0x2AAA] = 0x00550055;
			sect_addr[0] = 0x00300030;
#endif
			/* re-enable interrupts if necessary */
			if (flag)
				enable_interrupts();

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

#ifdef CONFIG_FLASH_16BIT
			while ((s_sect_addr[0] & 0x0080) != 0x0080) {
#else
			while ((sect_addr[0] & 0x00800080) != 0x00800080) {
#endif
				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;
				}
			}
		}
	}

	/* reset to read mode */
	addr = (volatile unsigned long *)info->start[0];
#ifdef CONFIG_FLASH_16BIT
	s_addr[0] = 0x00F0;	/* reset bank */
#else
	addr[0] = 0x00F000F0;	/* reset bank */
#endif

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

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - Flash not identified
 */

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

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

	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));
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_word (flash_info_t *info, ulong dest, ulong data)
{
	vu_long *addr = (vu_long*)(info->start[0]);

#ifdef CONFIG_FLASH_16BIT
	vu_short high_data;
	vu_short low_data;
	vu_short *s_addr = (vu_short*)addr;
#endif
	ulong start;
	int flag;

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

#ifdef CONFIG_FLASH_16BIT
	/* Write the 16 higher-bits */
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	high_data = ((data>>16) & 0x0000ffff);

	s_addr[0x5555] = 0x00AA;
	s_addr[0x2AAA] = 0x0055;
	s_addr[0x5555] = 0x00A0;

	*((vu_short *)dest) = high_data;


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

	/* data polling for D7 */
	start = get_timer (0);
	while ((*((vu_short *)dest) & 0x0080) != (high_data & 0x0080)) {
		if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
			return (1);
		}
	}


	/* Write the 16 lower-bits */
#endif

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();
#ifdef CONFIG_FLASH_16BIT
	dest += 0x2;
	low_data = (data & 0x0000ffff);

	s_addr[0x5555] = 0x00AA;
	s_addr[0x2AAA] = 0x0055;
	s_addr[0x5555] = 0x00A0;
	*((vu_short *)dest) = low_data;

#else
	addr[0x5555] = 0x00AA00AA;
	addr[0x2AAA] = 0x00550055;
	addr[0x5555] = 0x00A000A0;
	*((vu_long *)dest) = data;
#endif

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

	/* data polling for D7 */
	start = get_timer (0);

#ifdef CONFIG_FLASH_16BIT
	while ((*((vu_short *)dest) & 0x0080) != (low_data & 0x0080)) {
#else
	while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
#endif

		if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
			return (1);
		}
	}
	return (0);
}

/*-----------------------------------------------------------------------
 */
Commit	Line	Data
affae2bf WD	1	/*
	2	* (C) Copyright 2000
	3	* Wolfgang Denk, DENX Software Engineering, [email protected].
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24	#include <common.h>
	25	#include <mpc8xx.h>
	26
6d0f6bcf	27	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
affae2bf WD	28
	29	/*-----------------------------------------------------------------------
	30	* Functions
	31	*/
	32	static ulong flash_get_size (vu_long addr, flash_info_t info);
	33	static int write_word (flash_info_t *info, ulong dest, ulong data);
	34	static void flash_get_offsets (ulong base, flash_info_t *info);
	35
	36	/*-----------------------------------------------------------------------
	37	*/
	38
	39	unsigned long flash_init (void)
	40	{
6d0f6bcf	41	volatile immap_t immap = (immap_t )CONFIG_SYS_IMMR;
affae2bf WD	42	volatile memctl8xx_t *memctl = &immap->im_memctl;
	43	unsigned long size_b0, size_b1;
	44	int i;
	45
	46	/* Init: no FLASHes known */
6d0f6bcf	47	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
affae2bf WD	48	flash_info[i].flash_id = FLASH_UNKNOWN;
	49	}
	50
	51	/* Static FLASH Bank configuration here - FIXME XXX */
	52
	53	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
	54
	55	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
	56	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	57	size_b0, size_b0<<20);
	58	}
	59
	60	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
	61
	62	if (size_b1 > size_b0) {
	63	printf ("## ERROR: "
	64	"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
	65	size_b1, size_b1<<20,
	66	size_b0, size_b0<<20
	67	);
	68	flash_info[0].flash_id = FLASH_UNKNOWN;
	69	flash_info[1].flash_id = FLASH_UNKNOWN;
	70	flash_info[0].sector_count = -1;
	71	flash_info[1].sector_count = -1;
	72	flash_info[0].size = 0;
	73	flash_info[1].size = 0;
	74	return (0);
	75	}
	76
	77	/* Remap FLASH according to real size */
6d0f6bcf	78	memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH \| (-size_b0 & 0xFFFF8000);
affae2bf	79	#ifdef CONFIG_FLASH_16BIT
6d0f6bcf	80	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) \| BR_MS_GPCM \| BR_V \| BR_PS_16; /* 16 Bit data port */
affae2bf	81	#else
6d0f6bcf	82	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) \| BR_MS_GPCM \| BR_V;
affae2bf WD	83	#endif
	84
	85	/* Re-do sizing to get full correct info */
6d0f6bcf	86	size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
affae2bf	87
6d0f6bcf	88	flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);
affae2bf	89
6d0f6bcf	90	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
affae2bf WD	91	/* monitor protection ON by default */
affae2bf WD	92	flash_protect(FLAG_PROTECT_SET,
6d0f6bcf JCPV	93	CONFIG_SYS_MONITOR_BASE,
6d0f6bcf JCPV	94	CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
affae2bf WD	95	&flash_info[0]);
	96	#endif
	97
	98	if (size_b1) {
6d0f6bcf	99	memctl->memc_or1 = CONFIG_SYS_OR_TIMING_FLASH \| (-size_b1 & 0xFFFF8000);
affae2bf	100	#ifdef CONFIG_FLASH_16BIT
6d0f6bcf	101	memctl->memc_br1 = ((CONFIG_SYS_FLASH_BASE + size_b0) & BR_BA_MSK) \|
affae2bf WD	102	BR_MS_GPCM \| BR_V \| BR_PS_16;
affae2bf WD	103	#else
6d0f6bcf	104	memctl->memc_br1 = ((CONFIG_SYS_FLASH_BASE + size_b0) & BR_BA_MSK) \|
affae2bf WD	105	BR_MS_GPCM \| BR_V;
	106	#endif
	107
	108	/* Re-do sizing to get full correct info */
6d0f6bcf	109	size_b1 = flash_get_size((vu_long *)(CONFIG_SYS_FLASH_BASE + size_b0),
affae2bf WD	110	&flash_info[1]);
affae2bf WD	111
6d0f6bcf	112	flash_get_offsets (CONFIG_SYS_FLASH_BASE + size_b0, &flash_info[1]);
affae2bf	113
6d0f6bcf	114	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
affae2bf WD	115	/* monitor protection ON by default */
affae2bf WD	116	flash_protect(FLAG_PROTECT_SET,
6d0f6bcf JCPV	117	CONFIG_SYS_MONITOR_BASE,
6d0f6bcf JCPV	118	CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
affae2bf WD	119	&flash_info[1]);
	120	#endif
	121	} else {
	122	memctl->memc_br1 = 0; /* invalidate bank */
	123
	124	flash_info[1].flash_id = FLASH_UNKNOWN;
	125	flash_info[1].sector_count = -1;
	126	}
	127
	128	flash_info[0].size = size_b0;
	129	flash_info[1].size = size_b1;
	130
	131	return (size_b0 + size_b1);
	132	}
	133
	134	/*-----------------------------------------------------------------------
	135	*/
	136	static void flash_get_offsets (ulong base, flash_info_t *info)
	137	{
	138	int i;
	139
	140	if (info->flash_id == FLASH_UNKNOWN) {
	141	return;
	142	}
	143
	144	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
	145	for (i = 0; i < info->sector_count; i++) {
	146	info->start[i] = base + (i * 0x00002000);
	147	}
	148	return;
	149	}
	150
	151	/* set up sector start address table */
	152	if (info->flash_id & FLASH_BTYPE) {
	153	/* set sector offsets for bottom boot block type */
	154	#ifdef CONFIG_FLASH_16BIT
	155	info->start[0] = base + 0x00000000;
	156	info->start[1] = base + 0x00004000;
	157	info->start[2] = base + 0x00006000;
	158	info->start[3] = base + 0x00008000;
	159	for (i = 4; i < info->sector_count; i++) {
	160	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	161	#else
	162	info->start[0] = base + 0x00000000;
	163	info->start[1] = base + 0x00008000;
	164	info->start[2] = base + 0x0000C000;
	165	info->start[3] = base + 0x00010000;
	166	for (i = 4; i < info->sector_count; i++) {
	167	info->start[i] = base + (i * 0x00020000) - 0x00060000;
	168	#endif
	169	}
	170	} else {
	171	/* set sector offsets for top boot block type */
	172	i = info->sector_count - 1;
	173	info->start[i--] = base + info->size - 0x00008000;
	174	info->start[i--] = base + info->size - 0x0000C000;
	175	info->start[i--] = base + info->size - 0x00010000;
	176	for (; i >= 0; i--) {
	177	info->start[i] = base + i * 0x00020000;
	178	}
	179	}
	180
	181	}
	182
183	/*-----------------------------------------------------------------------
184	*/
185	void flash_print_info (flash_info_t *info)
186	{
187	int i;
188
189	if (info->flash_id == FLASH_UNKNOWN) {
190	printf ("missing or unknown FLASH type\n");
191	return;
192	}
193
194	switch (info->flash_id & FLASH_VENDMASK) {
195	case FLASH_MAN_AMD: printf ("AMD "); break;
196	case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
197	case FLASH_MAN_SST: printf ("SST "); break;
198	case FLASH_MAN_STM: printf ("STM "); break;
199	default: printf ("Unknown Vendor "); break;
200	}
201
202	switch (info->flash_id & FLASH_TYPEMASK) {
203	case FLASH_AM400B: printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
204	break;
205	case FLASH_AM400T: printf ("AM29LV400T (4 Mbit, top boot sector)\n");
206	break;
207	case FLASH_AM800B: printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
208	break;
209	case FLASH_AM800T: printf ("AM29LV800T (8 Mbit, top boot sector)\n");
210	break;
211	case FLASH_AM160B: printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
212	break;
213	case FLASH_AM160T: printf ("AM29LV160T (16 Mbit, top boot sector)\n");
214	break;
215	case FLASH_AM320B: printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
216	break;
217	case FLASH_AM320T: printf ("AM29LV320T (32 Mbit, top boot sector)\n");
218	break;
219	case FLASH_SST200A: printf ("39xF200A (2M = 128K x 16)\n");
220	break;
221	case FLASH_SST400A: printf ("39xF400A (4M = 256K x 16)\n");
222	break;
223	case FLASH_SST800A: printf ("39xF800A (8M = 512K x 16)\n");
224	break;
225	case FLASH_STM800AB: printf ("M29W800AB (8M = 512K x 16)\n");
226	break;
227	default: printf ("Unknown Chip Type\n");
228	break;
229	}
230
231	printf (" Size: %ld MB in %d Sectors\n",
232	info->size >> 20, info->sector_count);
233
234	printf (" Sector Start Addresses:");
235	for (i=0; i<info->sector_count; ++i) {
236	if ((i % 5) == 0)
237	printf ("\n ");
238	printf (" %08lX%s",
239	info->start[i],
240	info->protect[i] ? " (RO)" : " "
241	);
242	}
243	printf ("\n");
244	return;
245	}
246
247	/*-----------------------------------------------------------------------
248	*/
249
250
251	/*-----------------------------------------------------------------------
252	*/
253
254	/*
255	* The following code cannot be run from FLASH!
256	*/
257
258	static ulong flash_get_size (vu_long addr, flash_info_t info)
259	{
260	short i;
261	ulong value;
262	ulong base = (ulong)addr;
263
264	/* Write auto select command: read Manufacturer ID */
265	#ifdef CONFIG_FLASH_16BIT
266	vu_short s_addr = (vu_short)addr;
267	s_addr[0x5555] = 0x00AA;
268	s_addr[0x2AAA] = 0x0055;
269	s_addr[0x5555] = 0x0090;
270	value = s_addr[0];
271	value = value\|(value<<16);
272	#else
273	addr[0x5555] = 0x00AA00AA;
274	addr[0x2AAA] = 0x00550055;
275	addr[0x5555] = 0x00900090;
276	value = addr[0];
277	#endif
278
279	switch (value) {
280	case AMD_MANUFACT:
281	info->flash_id = FLASH_MAN_AMD;
282	break;
283	case FUJ_MANUFACT:
284	info->flash_id = FLASH_MAN_FUJ;
285	break;
286	case SST_MANUFACT:
287	info->flash_id = FLASH_MAN_SST;
288	break;
289	case STM_MANUFACT:
290	info->flash_id = FLASH_MAN_STM;
291	break;
292	default:
293	info->flash_id = FLASH_UNKNOWN;
294	info->sector_count = 0;
295	info->size = 0;
296	return (0); /* no or unknown flash */
297	}
298	#ifdef CONFIG_FLASH_16BIT
299	value = s_addr[1];
300	value = value\|(value<<16);
301	#else
302	value = addr[1]; /* device ID */
303	#endif
304
305	switch (value) {
306	case AMD_ID_LV400T:
307	info->flash_id += FLASH_AM400T;
308	info->sector_count = 11;
309	info->size = 0x00100000;
310	break; /* => 1 MB */
311
312	case AMD_ID_LV400B:
313	info->flash_id += FLASH_AM400B;
314	info->sector_count = 11;
315	info->size = 0x00100000;
316	break; /* => 1 MB */
317
318	case AMD_ID_LV800T:
319	info->flash_id += FLASH_AM800T;
320	info->sector_count = 19;
321	info->size = 0x00200000;
322	break; /* => 2 MB */
323
324	case AMD_ID_LV800B:
325	info->flash_id += FLASH_AM800B;
326	#ifdef CONFIG_FLASH_16BIT
327	info->sector_count = 19;
328	info->size = 0x00100000; /* => 1 MB */
329	#else
330	info->sector_count = 19;
331	info->size = 0x00200000; /* => 2 MB */
332	#endif
333	break;
334
335	case AMD_ID_LV160T:
336	info->flash_id += FLASH_AM160T;
337	info->sector_count = 35;
338	info->size = 0x00400000;
339	break; /* => 4 MB */
340
341	case AMD_ID_LV160B:
342	info->flash_id += FLASH_AM160B;
343	#ifdef CONFIG_FLASH_16BIT
344	info->sector_count = 35;
345	info->size = 0x00200000; /* => 2 MB */
346	#else
347	info->sector_count = 35;
348	info->size = 0x00400000; /* => 4 MB */
349	#endif
350
351	break;
352	#if 0 /* enable when device IDs are available */
353	case AMD_ID_LV320T:
354	info->flash_id += FLASH_AM320T;
355	info->sector_count = 67;
356	info->size = 0x00800000;
357	break; /* => 8 MB */
358
359	case AMD_ID_LV320B:
360	info->flash_id += FLASH_AM320B;
361	info->sector_count = 67;
362	info->size = 0x00800000;
363	break; /* => 8 MB */
364	#endif
365	case SST_ID_xF200A:
366	info->flash_id += FLASH_SST200A;
367	info->sector_count = 64; /* 39xF200A ID ( 2M = 128K x 16 ) */
368	info->size = 0x00080000;
369	break;
370	case SST_ID_xF400A:
371	info->flash_id += FLASH_SST400A;
372	info->sector_count = 128; /* 39xF400A ID ( 4M = 256K x 16 ) */
373	info->size = 0x00100000;
374	break;
375	case SST_ID_xF800A:
376	info->flash_id += FLASH_SST800A;
377	info->sector_count = 256; /* 39xF800A ID ( 8M = 512K x 16 ) */
378	info->size = 0x00200000;
379	break; /* => 2 MB */
380	case STM_ID_x800AB:
381	info->flash_id += FLASH_STM800AB;
382	info->sector_count = 19;
383	info->size = 0x00200000;
384	break; /* => 2 MB */
385	default:
386	info->flash_id = FLASH_UNKNOWN;
387	return (0); /* => no or unknown flash */
388
389	}
390
6d0f6bcf	391	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
affae2bf	392	printf (" ERROR: sector count %d > max (%d) \n",
6d0f6bcf JCPV	393	info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
6d0f6bcf JCPV	394	info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
affae2bf WD	395	}
	396
	397	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
	398	for (i = 0; i < info->sector_count; i++) {
	399	info->start[i] = base + (i * 0x00002000);
	400	}
	401	} else { /* AMD and Fujitsu types */
	402	/* set up sector start address table */
	403	if (info->flash_id & FLASH_BTYPE) {
	404	/* set sector offsets for bottom boot block type */
	405	#ifdef CONFIG_FLASH_16BIT
	406
	407	info->start[0] = base + 0x00000000;
	408	info->start[1] = base + 0x00004000;
	409	info->start[2] = base + 0x00006000;
	410	info->start[3] = base + 0x00008000;
	411	for (i = 4; i < info->sector_count; i++) {
	412	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	413	#else
	414	info->start[0] = base + 0x00000000;
	415	info->start[1] = base + 0x00008000;
	416	info->start[2] = base + 0x0000C000;
	417	info->start[3] = base + 0x00010000;
	418	for (i = 4; i < info->sector_count; i++) {
	419	info->start[i] = base + (i * 0x00020000) - 0x00060000;
	420	#endif
	421	}
	422	} else {
	423	/* set sector offsets for top boot block type */
	424	i = info->sector_count - 1;
	425	info->start[i--] = base + info->size - 0x00008000;
	426	info->start[i--] = base + info->size - 0x0000C000;
	427	info->start[i--] = base + info->size - 0x00010000;
	428	for (; i >= 0; i--) {
	429	info->start[i] = base + i * 0x00020000;
	430	}
	431	}
	432
	433	/* check for protected sectors */
	434	for (i = 0; i < info->sector_count; i++) {
	435	/* read sector protection at sector address:
	436	* (A7 .. A0) = 0x02
	437	* D0 = 1 if protected
	438	*/
	439	#ifdef CONFIG_FLASH_16BIT
	440	s_addr = (volatile unsigned short *)(info->start[i]);
	441	info->protect[i] = s_addr[2] & 1;
	442	#else
	443	addr = (volatile unsigned long *)(info->start[i]);
	444	info->protect[i] = addr[2] & 1;
	445	#endif
	446	}
	447	}
	448
	449	/*
	450	* Prevent writes to uninitialized FLASH.
	451	*/
	452	if (info->flash_id != FLASH_UNKNOWN) {
	453	#ifdef CONFIG_FLASH_16BIT
	454	s_addr = (volatile unsigned short *)(info->start[0]);
	455	s_addr = 0x00F0; / reset bank */
	456	#else
	457	addr = (volatile unsigned long *)info->start[0];
	458	addr = 0x00F000F0; / reset bank */
459	#endif
460
461	}
462	return (info->size);
463	}
464
465
466	/*-----------------------------------------------------------------------
467	*/
468
469	int flash_erase (flash_info_t *info, int s_first, int s_last)
470	{
471	vu_long addr = (vu_long)(info->start[0]);
472	int flag, prot, sect;
473	ulong start, now, last;
474	#ifdef CONFIG_FLASH_16BIT
475	vu_short s_addr = (vu_short)addr;
476	#endif
477
478	if ((s_first < 0) \|\| (s_first > s_last)) {
479	if (info->flash_id == FLASH_UNKNOWN) {
480	printf ("- missing\n");
481	} else {
482	printf ("- no sectors to erase\n");
483	}
484	return 1;
485	}
486	/*#ifndef CONFIG_FLASH_16BIT
487	ulong type;
488	type = (info->flash_id & FLASH_VENDMASK);
489	if ((type != FLASH_MAN_SST) && (type != FLASH_MAN_STM)) {
490	printf ("Can't erase unknown flash type %08lx - aborted\n",
491	info->flash_id);
492	return;
493	}
494	#endif*/
495	prot = 0;
496	for (sect=s_first; sect<=s_last; ++sect) {
497	if (info->protect[sect]) {
498	prot++;
499	}
500	}
501
502	if (prot) {
503	printf ("- Warning: %d protected sectors will not be erased!\n",
504	prot);
505	} else {
506	printf ("\n");
507	}
508
509	start = get_timer (0);
510	last = start;
511	/* Start erase on unprotected sectors */
512	for (sect = s_first; sect<=s_last; sect++) {
513	if (info->protect[sect] == 0) { /* not protected */
514	#ifdef CONFIG_FLASH_16BIT
515	vu_short s_sect_addr = (vu_short)(info->start[sect]);
516	#else
517	vu_long sect_addr = (vu_long)(info->start[sect]);
518	#endif
519	/* Disable interrupts which might cause a timeout here */
520	flag = disable_interrupts();
521
522	#ifdef CONFIG_FLASH_16BIT
523
524	/printf("\ns_sect_addr=%x",s_sect_addr);/
525	s_addr[0x5555] = 0x00AA;
526	s_addr[0x2AAA] = 0x0055;
527	s_addr[0x5555] = 0x0080;
528	s_addr[0x5555] = 0x00AA;
529	s_addr[0x2AAA] = 0x0055;
530	s_sect_addr[0] = 0x0030;
531	#else
532	addr[0x5555] = 0x00AA00AA;
533	addr[0x2AAA] = 0x00550055;
534	addr[0x5555] = 0x00800080;
535	addr[0x5555] = 0x00AA00AA;
536	addr[0x2AAA] = 0x00550055;
537	sect_addr[0] = 0x00300030;
538	#endif
539	/* re-enable interrupts if necessary */
540	if (flag)
541	enable_interrupts();
542
543	/* wait at least 80us - let's wait 1 ms */
544	udelay (1000);
545
546	#ifdef CONFIG_FLASH_16BIT
547	while ((s_sect_addr[0] & 0x0080) != 0x0080) {
548	#else
549	while ((sect_addr[0] & 0x00800080) != 0x00800080) {
550	#endif
6d0f6bcf	551	if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
affae2bf WD	552	printf ("Timeout\n");
	553	return 1;
	554	}
	555	/* show that we're waiting */
	556	if ((now - last) > 1000) { /* every second */
	557	putc ('.');
	558	last = now;
	559	}
	560	}
	561	}
	562	}
	563
	564	/* reset to read mode */
	565	addr = (volatile unsigned long *)info->start[0];
	566	#ifdef CONFIG_FLASH_16BIT
	567	s_addr[0] = 0x00F0; /* reset bank */
	568	#else
	569	addr[0] = 0x00F000F0; /* reset bank */
	570	#endif
	571
	572	printf (" done\n");
	573	return 0;
	574	}
	575
	576	/*-----------------------------------------------------------------------
	577	* Copy memory to flash, returns:
	578	* 0 - OK
	579	* 1 - write timeout
	580	* 2 - Flash not erased
	581	* 4 - Flash not identified
	582	*/
	583
	584	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
	585	{
	586	ulong cp, wp, data;
	587	int i, l, rc;
	588
	589	if (info->flash_id == FLASH_UNKNOWN) {
	590	return 4;
	591	}
	592
	593	wp = (addr & ~3); /* get lower word aligned address */
	594
	595	/*
	596	* handle unaligned start bytes
	597	*/
	598	if ((l = addr - wp) != 0) {
	599	data = 0;
	600	for (i=0, cp=wp; i<l; ++i, ++cp) {
	601	data = (data << 8) \| ((uchar )cp);
	602	}
	603	for (; i<4 && cnt>0; ++i) {
	604	data = (data << 8) \| *src++;
	605	--cnt;
	606	++cp;
	607	}
	608	for (; cnt==0 && i<4; ++i, ++cp) {
	609	data = (data << 8) \| ((uchar )cp);
	610	}
	611
	612	if ((rc = write_word(info, wp, data)) != 0) {
	613	return (rc);
	614	}
	615	wp += 4;
616	}
617
618	/*
619	* handle word aligned part
620	*/
621	while (cnt >= 4) {
622	data = 0;
623	for (i=0; i<4; ++i) {
624	data = (data << 8) \| *src++;
625	}
626	if ((rc = write_word(info, wp, data)) != 0) {
627	return (rc);
628	}
629	wp += 4;
630	cnt -= 4;
631	}
632
633	if (cnt == 0) {
634	return (0);
635	}
636
637	/*
638	* handle unaligned tail bytes
639	*/
640	data = 0;
641	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
642	data = (data << 8) \| *src++;
643	--cnt;
644	}
645	for (; i<4; ++i, ++cp) {
646	data = (data << 8) \| ((uchar )cp);
647	}
648
649	return (write_word(info, wp, data));
650	}
651
652	/*-----------------------------------------------------------------------
653	* Write a word to Flash, returns:
654	* 0 - OK
655	* 1 - write timeout
656	* 2 - Flash not erased
657	*/
658	static int write_word (flash_info_t *info, ulong dest, ulong data)
659	{
660	vu_long addr = (vu_long)(info->start[0]);
661
662	#ifdef CONFIG_FLASH_16BIT
663	vu_short high_data;
664	vu_short low_data;
665	vu_short s_addr = (vu_short)addr;
666	#endif
667	ulong start;
668	int flag;
669
670	/* Check if Flash is (sufficiently) erased */
671	if ((((vu_long )dest) & data) != data) {
672	return (2);
673	}
674
675	#ifdef CONFIG_FLASH_16BIT
676	/* Write the 16 higher-bits */
677	/* Disable interrupts which might cause a timeout here */
678	flag = disable_interrupts();
679
680	high_data = ((data>>16) & 0x0000ffff);
681
682	s_addr[0x5555] = 0x00AA;
683	s_addr[0x2AAA] = 0x0055;
684	s_addr[0x5555] = 0x00A0;
685
686	((vu_short )dest) = high_data;
687
688
689	/* re-enable interrupts if necessary */
690	if (flag)
691	enable_interrupts();
692
693	/* data polling for D7 */
694	start = get_timer (0);
695	while ((((vu_short )dest) & 0x0080) != (high_data & 0x0080)) {
6d0f6bcf	696	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
affae2bf WD	697	return (1);
	698	}
	699	}
	700
	701
	702	/* Write the 16 lower-bits */
	703	#endif
	704
	705	/* Disable interrupts which might cause a timeout here */
	706	flag = disable_interrupts();
	707	#ifdef CONFIG_FLASH_16BIT
	708	dest += 0x2;
	709	low_data = (data & 0x0000ffff);
	710
	711	s_addr[0x5555] = 0x00AA;
	712	s_addr[0x2AAA] = 0x0055;
	713	s_addr[0x5555] = 0x00A0;
	714	((vu_short )dest) = low_data;
	715
	716	#else
	717	addr[0x5555] = 0x00AA00AA;
	718	addr[0x2AAA] = 0x00550055;
	719	addr[0x5555] = 0x00A000A0;
	720	((vu_long )dest) = data;
	721	#endif
	722
	723	/* re-enable interrupts if necessary */
	724	if (flag)
	725	enable_interrupts();
	726
	727	/* data polling for D7 */
	728	start = get_timer (0);
	729
	730	#ifdef CONFIG_FLASH_16BIT
	731	while ((((vu_short )dest) & 0x0080) != (low_data & 0x0080)) {
	732	#else
	733	while ((((vu_long )dest) & 0x00800080) != (data & 0x00800080)) {
	734	#endif
	735
6d0f6bcf	736	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
affae2bf WD	737	return (1);
	738	}
	739	}
	740	return (0);
	741	}
	742
	743	/*-----------------------------------------------------------------------
	744	*/